diff --git a/.circleci/config.yml b/.circleci/config.yml
index 3723c57..8abf304 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -10,7 +10,7 @@ jobs:
     steps:
     - checkout
     - run: make promu
-    - run: make
+    - run: make check_license style staticcheck unused build test-short
     - run: rm -v mysqld_exporter
 
   codespell:
diff --git a/collector/binlog.go b/collector/binlog.go
index 94ac61c..1f915c9 100644
--- a/collector/binlog.go
+++ b/collector/binlog.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `SHOW BINARY LOGS`
 
 package collector
diff --git a/collector/binlog_test.go b/collector/binlog_test.go
index 41fb42c..4008ba4 100644
--- a/collector/binlog_test.go
+++ b/collector/binlog_test.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/collector.go b/collector/collector.go
index b7c0968..10c1256 100644
--- a/collector/collector.go
+++ b/collector/collector.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/collector_test.go b/collector/collector_test.go
index 8b228ac..4600019 100644
--- a/collector/collector_test.go
+++ b/collector/collector_test.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/engine_innodb.go b/collector/engine_innodb.go
index a5223b4..cd783d4 100644
--- a/collector/engine_innodb.go
+++ b/collector/engine_innodb.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `SHOW ENGINE INNODB STATUS`.
 
 package collector
diff --git a/collector/engine_innodb_test.go b/collector/engine_innodb_test.go
index 9a20d9b..1d13907 100644
--- a/collector/engine_innodb_test.go
+++ b/collector/engine_innodb_test.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/engine_tokudb.go b/collector/engine_tokudb.go
index 275ac49..d5fc919 100644
--- a/collector/engine_tokudb.go
+++ b/collector/engine_tokudb.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `SHOW ENGINE TOKUDB STATUS`.
 
 package collector
diff --git a/collector/engine_tokudb_test.go b/collector/engine_tokudb_test.go
index 7bdd6d1..92f7cb0 100644
--- a/collector/engine_tokudb_test.go
+++ b/collector/engine_tokudb_test.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/exporter.go b/collector/exporter.go
index da8ff51..690be8b 100644
--- a/collector/exporter.go
+++ b/collector/exporter.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/exporter_test.go b/collector/exporter_test.go
index e52903e..3e0ead7 100644
--- a/collector/exporter_test.go
+++ b/collector/exporter_test.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/global_status.go b/collector/global_status.go
index 13f9ade..6303ed4 100644
--- a/collector/global_status.go
+++ b/collector/global_status.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `SHOW GLOBAL STATUS`.
 
 package collector
diff --git a/collector/global_status_test.go b/collector/global_status_test.go
index 34609cb..8d0c587 100644
--- a/collector/global_status_test.go
+++ b/collector/global_status_test.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/global_variables.go b/collector/global_variables.go
index 2480f52..64eb883 100644
--- a/collector/global_variables.go
+++ b/collector/global_variables.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `SHOW GLOBAL VARIABLES`.
 
 package collector
diff --git a/collector/global_variables_test.go b/collector/global_variables_test.go
index 73507f9..f4285d1 100644
--- a/collector/global_variables_test.go
+++ b/collector/global_variables_test.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/heartbeat.go b/collector/heartbeat.go
index 1a6c69d..6fe6a7d 100644
--- a/collector/heartbeat.go
+++ b/collector/heartbeat.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape heartbeat data.
 
 package collector
diff --git a/collector/heartbeat_test.go b/collector/heartbeat_test.go
index 571c21d..059486e 100644
--- a/collector/heartbeat_test.go
+++ b/collector/heartbeat_test.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/info_schema.go b/collector/info_schema.go
index fb53b58..fda16da 100644
--- a/collector/info_schema.go
+++ b/collector/info_schema.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 // Subsystem.
diff --git a/collector/info_schema_auto_increment.go b/collector/info_schema_auto_increment.go
index 72b8d6e..129a52d 100644
--- a/collector/info_schema_auto_increment.go
+++ b/collector/info_schema_auto_increment.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape auto_increment column information.
 
 package collector
diff --git a/collector/info_schema_clientstats.go b/collector/info_schema_clientstats.go
index 3d61c48..968cc2e 100644
--- a/collector/info_schema_clientstats.go
+++ b/collector/info_schema_clientstats.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `information_schema.client_statistics`.
 
 package collector
diff --git a/collector/info_schema_clientstats_test.go b/collector/info_schema_clientstats_test.go
index 2d74b7e..8c70f86 100644
--- a/collector/info_schema_clientstats_test.go
+++ b/collector/info_schema_clientstats_test.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/info_schema_innodb_cmp.go b/collector/info_schema_innodb_cmp.go
index 1363932..03047fb 100644
--- a/collector/info_schema_innodb_cmp.go
+++ b/collector/info_schema_innodb_cmp.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `information_schema.INNODB_CMP`.
 
 package collector
diff --git a/collector/info_schema_innodb_cmp_test.go b/collector/info_schema_innodb_cmp_test.go
index 3fbae15..1e59394 100644
--- a/collector/info_schema_innodb_cmp_test.go
+++ b/collector/info_schema_innodb_cmp_test.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/info_schema_innodb_cmpmem.go b/collector/info_schema_innodb_cmpmem.go
index 3280755..cfe56d7 100644
--- a/collector/info_schema_innodb_cmpmem.go
+++ b/collector/info_schema_innodb_cmpmem.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `information_schema.INNODB_CMPMEM`.
 
 package collector
diff --git a/collector/info_schema_innodb_cmpmem_test.go b/collector/info_schema_innodb_cmpmem_test.go
index 87475e1..c9e20c2 100644
--- a/collector/info_schema_innodb_cmpmem_test.go
+++ b/collector/info_schema_innodb_cmpmem_test.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/info_schema_innodb_metrics.go b/collector/info_schema_innodb_metrics.go
index 56bbd21..ae510a7 100644
--- a/collector/info_schema_innodb_metrics.go
+++ b/collector/info_schema_innodb_metrics.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `information_schema.innodb_metrics`.
 
 package collector
diff --git a/collector/info_schema_innodb_metrics_test.go b/collector/info_schema_innodb_metrics_test.go
index b91cb09..2ad6bbe 100644
--- a/collector/info_schema_innodb_metrics_test.go
+++ b/collector/info_schema_innodb_metrics_test.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/info_schema_innodb_sys_tablespaces.go b/collector/info_schema_innodb_sys_tablespaces.go
index 7ec60da..4eaad60 100644
--- a/collector/info_schema_innodb_sys_tablespaces.go
+++ b/collector/info_schema_innodb_sys_tablespaces.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `information_schema.innodb_sys_tablespaces`.
 
 package collector
diff --git a/collector/info_schema_innodb_sys_tablespaces_test.go b/collector/info_schema_innodb_sys_tablespaces_test.go
index 1ffeee5..770c24c 100644
--- a/collector/info_schema_innodb_sys_tablespaces_test.go
+++ b/collector/info_schema_innodb_sys_tablespaces_test.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/info_schema_processlist.go b/collector/info_schema_processlist.go
index 9f5a009..448fdd8 100644
--- a/collector/info_schema_processlist.go
+++ b/collector/info_schema_processlist.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `information_schema.processlist`.
 
 package collector
diff --git a/collector/info_schema_query_response_time.go b/collector/info_schema_query_response_time.go
index b8292a1..f90da39 100644
--- a/collector/info_schema_query_response_time.go
+++ b/collector/info_schema_query_response_time.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `information_schema.query_response_time*` tables.
 
 package collector
diff --git a/collector/info_schema_query_response_time_test.go b/collector/info_schema_query_response_time_test.go
index a4d7501..0c3098d 100644
--- a/collector/info_schema_query_response_time_test.go
+++ b/collector/info_schema_query_response_time_test.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/info_schema_tables.go b/collector/info_schema_tables.go
index 79b9288..5597ad6 100644
--- a/collector/info_schema_tables.go
+++ b/collector/info_schema_tables.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `information_schema.tables`.
 
 package collector
diff --git a/collector/info_schema_tablestats.go b/collector/info_schema_tablestats.go
index 0d6fc3f..f0bf8b5 100644
--- a/collector/info_schema_tablestats.go
+++ b/collector/info_schema_tablestats.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `information_schema.table_statistics`.
 
 package collector
diff --git a/collector/info_schema_tablestats_test.go b/collector/info_schema_tablestats_test.go
index b4e6b63..7106275 100644
--- a/collector/info_schema_tablestats_test.go
+++ b/collector/info_schema_tablestats_test.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/info_schema_userstats.go b/collector/info_schema_userstats.go
index 1028b26..671cf15 100644
--- a/collector/info_schema_userstats.go
+++ b/collector/info_schema_userstats.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `information_schema.user_statistics`.
 
 package collector
diff --git a/collector/info_schema_userstats_test.go b/collector/info_schema_userstats_test.go
index 9895eb3..607cfc0 100644
--- a/collector/info_schema_userstats_test.go
+++ b/collector/info_schema_userstats_test.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/perf_schema.go b/collector/perf_schema.go
index 863b95c..afaa278 100644
--- a/collector/perf_schema.go
+++ b/collector/perf_schema.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 // Subsystem.
diff --git a/collector/perf_schema_events_statements.go b/collector/perf_schema_events_statements.go
index f356f33..9b811ab 100644
--- a/collector/perf_schema_events_statements.go
+++ b/collector/perf_schema_events_statements.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `performance_schema.events_statements_summary_by_digest`.
 
 package collector
diff --git a/collector/perf_schema_events_waits.go b/collector/perf_schema_events_waits.go
index f621fa6..5a7e3a2 100644
--- a/collector/perf_schema_events_waits.go
+++ b/collector/perf_schema_events_waits.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `performance_schema.events_waits_summary_global_by_event_name`.
 
 package collector
diff --git a/collector/perf_schema_file_events.go b/collector/perf_schema_file_events.go
index 097ddcd..33ce3b8 100644
--- a/collector/perf_schema_file_events.go
+++ b/collector/perf_schema_file_events.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `performance_schema.file_summary_by_event_name`.
 
 package collector
diff --git a/collector/perf_schema_file_instances.go b/collector/perf_schema_file_instances.go
index 52316ff..5b4c295 100644
--- a/collector/perf_schema_file_instances.go
+++ b/collector/perf_schema_file_instances.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `performance_schema.file_summary_by_instance`.
 
 package collector
diff --git a/collector/perf_schema_file_instances_test.go b/collector/perf_schema_file_instances_test.go
index 9a2a551..dcd1000 100644
--- a/collector/perf_schema_file_instances_test.go
+++ b/collector/perf_schema_file_instances_test.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/perf_schema_index_io_waits.go b/collector/perf_schema_index_io_waits.go
index b034bcb..2fb1dbd 100644
--- a/collector/perf_schema_index_io_waits.go
+++ b/collector/perf_schema_index_io_waits.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `performance_schema.table_io_waits_summary_by_index_usage`.
 
 package collector
diff --git a/collector/perf_schema_index_io_waits_test.go b/collector/perf_schema_index_io_waits_test.go
index 703f3c2..9ce6fb1 100644
--- a/collector/perf_schema_index_io_waits_test.go
+++ b/collector/perf_schema_index_io_waits_test.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/perf_schema_replication_group_member_stats.go b/collector/perf_schema_replication_group_member_stats.go
index 7901fb4..123fe5a 100644
--- a/collector/perf_schema_replication_group_member_stats.go
+++ b/collector/perf_schema_replication_group_member_stats.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/perf_schema_table_io_waits.go b/collector/perf_schema_table_io_waits.go
index 74bd2ee..347c2a5 100644
--- a/collector/perf_schema_table_io_waits.go
+++ b/collector/perf_schema_table_io_waits.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `performance_schema.table_io_waits_summary_by_table`.
 
 package collector
diff --git a/collector/perf_schema_table_lock_waits.go b/collector/perf_schema_table_lock_waits.go
index fb77c7f..406d988 100644
--- a/collector/perf_schema_table_lock_waits.go
+++ b/collector/perf_schema_table_lock_waits.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `performance_schema.table_lock_waits_summary_by_table`.
 
 package collector
diff --git a/collector/scraper.go b/collector/scraper.go
index eb5f8d4..a7d29cc 100644
--- a/collector/scraper.go
+++ b/collector/scraper.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/slave_hosts.go b/collector/slave_hosts.go
index 1ba13cd..13d6062 100644
--- a/collector/slave_hosts.go
+++ b/collector/slave_hosts.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape heartbeat data.
 
 package collector
diff --git a/collector/slave_hosts_test.go b/collector/slave_hosts_test.go
index 734df61..038e94f 100644
--- a/collector/slave_hosts_test.go
+++ b/collector/slave_hosts_test.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/collector/slave_status.go b/collector/slave_status.go
index 2df74ce..8ce74e7 100644
--- a/collector/slave_status.go
+++ b/collector/slave_status.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // Scrape `SHOW SLAVE STATUS`.
 
 package collector
diff --git a/collector/slave_status_test.go b/collector/slave_status_test.go
index 1cfd004..fe3b085 100644
--- a/collector/slave_status_test.go
+++ b/collector/slave_status_test.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package collector
 
 import (
diff --git a/mysqld_exporter.go b/mysqld_exporter.go
index 68f469c..ce3bef6 100644
--- a/mysqld_exporter.go
+++ b/mysqld_exporter.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package main
 
 import (
diff --git a/mysqld_exporter_test.go b/mysqld_exporter_test.go
index e6aa81d..a6280b8 100644
--- a/mysqld_exporter_test.go
+++ b/mysqld_exporter_test.go
@@ -1,3 +1,16 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package main
 
 import (