diff --git a/collector/pg_stat_user_indexes.go b/collector/pg_stat_user_indexes.go
new file mode 100644
index 00000000..e16a35e1
--- /dev/null
+++ b/collector/pg_stat_user_indexes.go
@@ -0,0 +1,141 @@
+// Copyright 2023 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 (
+ "context"
+ "database/sql"
+
+ "github.com/go-kit/log"
+ "github.com/go-kit/log/level"
+ "github.com/prometheus/client_golang/prometheus"
+)
+
+func init() {
+ registerCollector(statUserIndexesSubsystem, defaultDisabled, NewPGStatUserIndexesCollector)
+}
+
+type PGStatUserIndexesCollector struct {
+ log log.Logger
+}
+
+const statUserIndexesSubsystem = "stat_user_indexes"
+
+func NewPGStatUserIndexesCollector(config collectorConfig) (Collector, error) {
+ return &PGStatUserIndexesCollector{log: config.logger}, nil
+}
+
+var (
+ statUserIndexesIdxScan = prometheus.NewDesc(
+ prometheus.BuildFQName(namespace, statUserIndexesSubsystem, "idx_scans_total"),
+ "Number of index scans initiated on this index",
+ []string{"schemaname", "relname", "indexrelname"},
+ prometheus.Labels{},
+ )
+ statUserIndexesIdxTupRead = prometheus.NewDesc(
+ prometheus.BuildFQName(namespace, statUserIndexesSubsystem, "idx_tup_reads_total"),
+ "Number of index entries returned by scans on this index",
+ []string{"schemaname", "relname", "indexrelname"},
+ prometheus.Labels{},
+ )
+ statUserIndexesIdxTupFetch = prometheus.NewDesc(
+ prometheus.BuildFQName(namespace, statUserIndexesSubsystem, "idx_tup_fetches_total"),
+ "Number of live table rows fetched by simple index scans using this index",
+ []string{"schemaname", "relname", "indexrelname"},
+ prometheus.Labels{},
+ )
+
+ statUserIndexesQuery = `
+ SELECT
+ schemaname,
+ relname,
+ indexrelname,
+ idx_scan,
+ idx_tup_read,
+ idx_tup_fetch
+ FROM pg_stat_user_indexes
+ `
+)
+
+func (c *PGStatUserIndexesCollector) Update(ctx context.Context, instance *instance, ch chan<- prometheus.Metric) error {
+ db := instance.getDB()
+ rows, err := db.QueryContext(ctx,
+ statUserIndexesQuery)
+
+ if err != nil {
+ return err
+ }
+ defer rows.Close()
+ for rows.Next() {
+ var schemaname, relname, indexrelname sql.NullString
+ var idxScan, idxTupRead, idxTupFetch sql.NullFloat64
+
+ if err := rows.Scan(&schemaname, &relname, &indexrelname, &idxScan, &idxTupRead, &idxTupFetch); err != nil {
+ return err
+ }
+ if !schemaname.Valid {
+ level.Debug(c.log).Log("msg", "Skipping stats on index because schemaname is not valid")
+ continue
+ }
+ if !relname.Valid {
+ level.Debug(c.log).Log("msg", "Skipping stats on index because relname is not valid")
+ continue
+ }
+ if !indexrelname.Valid {
+ level.Debug(c.log).Log("msg", "Skipping stats on index because indexrelname is not valid")
+ continue
+ }
+ labels := []string{schemaname.String, relname.String, indexrelname.String}
+
+ if !idxScan.Valid {
+ level.Debug(c.log).Log("msg", "Skipping stats on index because idx_scan is not valid")
+ continue
+ }
+ if !idxTupRead.Valid {
+ level.Debug(c.log).Log("msg", "Skipping stats on index because idx_tup_read is not valid")
+ continue
+ }
+ if !idxTupFetch.Valid {
+ level.Debug(c.log).Log("msg", "Skipping stats on index because idx_tup_fetch is not valid")
+ continue
+ }
+
+ idxScanMetric := idxScan.Float64
+ ch <- prometheus.MustNewConstMetric(
+ statUserIndexesIdxScan,
+ prometheus.CounterValue,
+ idxScanMetric,
+ labels...,
+ )
+
+ idxTupReadMetric := idxTupRead.Float64
+ ch <- prometheus.MustNewConstMetric(
+ statUserIndexesIdxTupRead,
+ prometheus.CounterValue,
+ idxTupReadMetric,
+ labels...,
+ )
+
+ idxTupFetchMetric := idxTupFetch.Float64
+ ch <- prometheus.MustNewConstMetric(
+ statUserIndexesIdxTupFetch,
+ prometheus.CounterValue,
+ idxTupFetchMetric,
+ labels...,
+ )
+ }
+ if err := rows.Err(); err != nil {
+ return err
+ }
+ return nil
+}
diff --git a/collector/pg_stat_user_indexes_test.go b/collector/pg_stat_user_indexes_test.go
new file mode 100644
index 00000000..ce59355b
--- /dev/null
+++ b/collector/pg_stat_user_indexes_test.go
@@ -0,0 +1,68 @@
+// Copyright 2023 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 (
+ "context"
+ "testing"
+
+ "github.com/DATA-DOG/go-sqlmock"
+ "github.com/prometheus/client_golang/prometheus"
+ dto "github.com/prometheus/client_model/go"
+ "github.com/smartystreets/goconvey/convey"
+)
+
+func TestPgStatUserIndexesCollector(t *testing.T) {
+ db, mock, err := sqlmock.New()
+ if err != nil {
+ t.Fatalf("Error opening a stub db connection: %s", err)
+ }
+ defer db.Close()
+ inst := &instance{db: db}
+ columns := []string{
+ "schemaname",
+ "relname",
+ "indexrelname",
+ "idx_scan",
+ "idx_tup_read",
+ "idx_tup_fetch",
+ }
+ rows := sqlmock.NewRows(columns).
+ AddRow("public", "pgbench_accounts", "pgbench_accounts_pkey", 5, 6, 7)
+
+ mock.ExpectQuery(sanitizeQuery(statUserIndexesQuery)).WillReturnRows(rows)
+
+ ch := make(chan prometheus.Metric)
+ go func() {
+ defer close(ch)
+ c := PGStatUserIndexesCollector{}
+
+ if err := c.Update(context.Background(), inst, ch); err != nil {
+ t.Errorf("Error calling PGStatUserIndexesCollector.Update: %s", err)
+ }
+ }()
+ expected := []MetricResult{
+ {labels: labelMap{"schemaname": "public", "relname": "pgbench_accounts", "indexrelname": "pgbench_accounts_pkey"}, value: 5, metricType: dto.MetricType_COUNTER},
+ {labels: labelMap{"schemaname": "public", "relname": "pgbench_accounts", "indexrelname": "pgbench_accounts_pkey"}, value: 6, metricType: dto.MetricType_COUNTER},
+ {labels: labelMap{"schemaname": "public", "relname": "pgbench_accounts", "indexrelname": "pgbench_accounts_pkey"}, value: 7, metricType: dto.MetricType_COUNTER},
+ }
+ convey.Convey("Metrics comparison", t, func() {
+ for _, expect := range expected {
+ m := readMetric(<-ch)
+ convey.So(expect, convey.ShouldResemble, m)
+ }
+ })
+ if err := mock.ExpectationsWereMet(); err != nil {
+ t.Errorf("there were unfulfilled exceptions: %s", err)
+ }
+}