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// 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"
"log/slog"
"github.com/prometheus/client_golang/prometheus"
)
const statActivityAutovacuumSubsystem = "stat_activity_autovacuum"
func init() {
registerCollector(statActivityAutovacuumSubsystem, defaultDisabled, NewPGStatActivityAutovacuumCollector)
}
type PGStatActivityAutovacuumCollector struct {
log *slog.Logger
}
func NewPGStatActivityAutovacuumCollector(config collectorConfig) (Collector, error) {
return &PGStatActivityAutovacuumCollector{log: config.logger}, nil
}
var (
statActivityAutovacuumAgeInSeconds = prometheus.NewDesc(
prometheus.BuildFQName(namespace, statActivityAutovacuumSubsystem, "timestamp_seconds"),
"Start timestamp of the vacuum process in seconds",
[]string{"relname"},
prometheus.Labels{},
)
statActivityAutovacuumQuery = `
SELECT
SPLIT_PART(query, '.', 2) AS relname,
EXTRACT(EPOCH FROM xact_start) AS timestamp_seconds
FROM
pg_catalog.pg_stat_activity
WHERE
query LIKE 'autovacuum:%'
`
)
func (PGStatActivityAutovacuumCollector) Update(ctx context.Context, instance *instance, ch chan<- prometheus.Metric) error {
db := instance.getDB()
rows, err := db.QueryContext(ctx,
statActivityAutovacuumQuery)
if err != nil {
return err
}
defer rows.Close()
for rows.Next() {
var relname string
var ageInSeconds float64
if err := rows.Scan(&relname, &ageInSeconds); err != nil {
return err
}
ch <- prometheus.MustNewConstMetric(
statActivityAutovacuumAgeInSeconds,
prometheus.GaugeValue,
ageInSeconds, relname,
)
}
if err := rows.Err(); err != nil {
return err
}
return nil
}
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