chore: fix a typo and use slices.Contains (#1176)

Minor fixes as I was skimming through:
- fix typo in `stat_statements`
- drop custom `sliceContains` in `database`

Signed-off-by: Cristian Greco <cristian@regolo.cc>

collector/pg_database.go

@@ -17,6 +17,7 @@ import (
 	"context"
 	"database/sql"
 	"log/slog"
+	"slices"
 
 	"github.com/prometheus/client_golang/prometheus"
 )
@@ -102,7 +103,7 @@ func (c PGDatabaseCollector) Update(ctx context.Context, instance *instance, ch
 		// Ignore excluded databases
 		// Filtering is done here instead of in the query to avoid
 		// a complicated NOT IN query with a variable number of parameters
-		if sliceContains(c.excludedDatabases, database) {
+		if slices.Contains(c.excludedDatabases, database) {
 			continue
 		}
 
@@ -138,12 +139,3 @@ func (c PGDatabaseCollector) Update(ctx context.Context, instance *instance, ch
 	}
 	return rows.Err()
 }
-
-func sliceContains(slice []string, s string) bool {
-	for _, item := range slice {
-		if item == s {
-			return true
-		}
-	}
-	return false
-}

collector/pg_stat_statements.go

@@ -64,7 +64,7 @@ func NewPGStatStatementsCollector(config collectorConfig) (Collector, error) {
 }
 
 var (
-	statSTatementsCallsTotal = prometheus.NewDesc(
+	statStatementsCallsTotal = prometheus.NewDesc(
 		prometheus.BuildFQName(namespace, statStatementsSubsystem, "calls_total"),
 		"Number of times executed",
 		[]string{"user", "datname", "queryid"},
@@ -230,7 +230,7 @@ func (c PGStatStatementsCollector) Update(ctx context.Context, instance *instanc
 			callsTotalMetric = float64(callsTotal.Int64)
 		}
 		ch <- prometheus.MustNewConstMetric(
-			statSTatementsCallsTotal,
+			statStatementsCallsTotal,
 			prometheus.CounterValue,
 			callsTotalMetric,
 			userLabel, datnameLabel, queryidLabel,