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Capture usename and application_name for pg_stat_activity

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It is necessary to be able to exclude backups from long-running
transaction alerts, as they are to be expected. With the current
pg_stat_activity metric there is no ability to filter out
specific users or application names.

Resolves #668

Signed-off-by: cezmunsta <github@incoming-email.co.uk>
This commit is contained in:
cezmunsta
2022-08-15 11:01:41 +01:00
parent 6eac43241d
commit 6937685907
2 changed files with 10 additions and 2 deletions
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2
cmd/postgres_exporter/postgres_exporter.go
View File

@@ -284,6 +284,8 @@ var builtinMetricMaps = map[string]intermediateMetricMap{
map[string]ColumnMapping{
"datname": {LABEL, "Name of this database", nil, nil},
"state": {LABEL, "connection state", nil, semver.MustParseRange(">=9.2.0")},
"usename": {LABEL, "connection usename", nil, nil},
"application_name": {LABEL, "connection application_name", nil, nil},
"count": {GAUGE, "number of connections in this state", nil, nil},
"max_tx_duration": {GAUGE, "max duration in seconds any active transaction has been running", nil, nil},
},

10
cmd/postgres_exporter/queries.go
View File

@@ -137,6 +137,8 @@ var queryOverrides = map[string][]OverrideQuery{
SELECT
pg_database.datname,
tmp.state,
tmp2.usename,
tmp2.application_name,
COALESCE(count,0) as count,
COALESCE(max_tx_duration,0) as max_tx_duration
FROM
@@ -153,9 +155,11 @@ var queryOverrides = map[string][]OverrideQuery{
SELECT
datname,
state,
usename,
application_name,
count(*) AS count,
MAX(EXTRACT(EPOCH FROM now() - xact_start))::float AS max_tx_duration
FROM pg_stat_activity GROUP BY datname,state) AS tmp2
FROM pg_stat_activity GROUP BY datname,state,usename,application_name) AS tmp2
ON tmp.state = tmp2.state AND pg_database.datname = tmp2.datname
`,
},
@@ -165,9 +169,11 @@ var queryOverrides = map[string][]OverrideQuery{
SELECT
datname,
'unknown' AS state,
usename,
application_name,
COALESCE(count(*),0) AS count,
COALESCE(MAX(EXTRACT(EPOCH FROM now() - xact_start))::float,0) AS max_tx_duration
FROM pg_stat_activity GROUP BY datname
FROM pg_stat_activity GROUP BY datname,usename,application_name
`,
},
},