mirror of
https://github.com/prometheus-community/postgres_exporter
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ab33346cbd
The intent is to use the instance struct to hold the connection to the database as well as metadata about the instance. Currently this metadata only includes the version of postgres for the instance which can be used in the collectors to decide what query to run. In the future this could hold more metadata but for now it keeps the Collector interface arguments to a reasonable number. Signed-off-by: Joe Adams <github@joeadams.io>
118 lines
2.9 KiB
Go
118 lines
2.9 KiB
Go
// Copyright 2023 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package collector
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import (
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"context"
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"github.com/go-kit/log"
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"github.com/prometheus/client_golang/prometheus"
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)
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const replicationSlotSubsystem = "replication_slot"
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func init() {
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registerCollector(replicationSlotSubsystem, defaultEnabled, NewPGReplicationSlotCollector)
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}
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type PGReplicationSlotCollector struct {
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log log.Logger
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}
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func NewPGReplicationSlotCollector(config collectorConfig) (Collector, error) {
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return &PGReplicationSlotCollector{log: config.logger}, nil
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}
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var (
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pgReplicationSlotCurrentWalDesc = prometheus.NewDesc(
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prometheus.BuildFQName(
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namespace,
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replicationSlotSubsystem,
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"slot_current_wal_lsn",
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),
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"current wal lsn value",
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[]string{"slot_name"}, nil,
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)
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pgReplicationSlotCurrentFlushDesc = prometheus.NewDesc(
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prometheus.BuildFQName(
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namespace,
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replicationSlotSubsystem,
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"slot_confirmed_flush_lsn",
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),
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"last lsn confirmed flushed to the replication slot",
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[]string{"slot_name"}, nil,
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)
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pgReplicationSlotIsActiveDesc = prometheus.NewDesc(
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prometheus.BuildFQName(
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namespace,
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replicationSlotSubsystem,
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"slot_is_active",
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),
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"whether the replication slot is active or not",
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[]string{"slot_name"}, nil,
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)
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pgReplicationSlotQuery = `SELECT
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slot_name,
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pg_current_wal_lsn() - '0/0' AS current_wal_lsn,
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coalesce(confirmed_flush_lsn, '0/0') - '0/0',
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active
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FROM
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pg_replication_slots;`
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)
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func (PGReplicationSlotCollector) Update(ctx context.Context, instance *instance, ch chan<- prometheus.Metric) error {
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db := instance.getDB()
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rows, err := db.QueryContext(ctx,
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pgReplicationSlotQuery)
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if err != nil {
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return err
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}
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defer rows.Close()
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for rows.Next() {
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var slotName string
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var walLSN int64
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var flushLSN int64
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var isActive bool
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if err := rows.Scan(&slotName, &walLSN, &flushLSN, &isActive); err != nil {
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return err
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}
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isActiveValue := 0
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if isActive {
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isActiveValue = 1
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}
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ch <- prometheus.MustNewConstMetric(
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pgReplicationSlotCurrentWalDesc,
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prometheus.GaugeValue, float64(walLSN), slotName,
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)
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if isActive {
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ch <- prometheus.MustNewConstMetric(
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pgReplicationSlotCurrentFlushDesc,
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prometheus.GaugeValue, float64(flushLSN), slotName,
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)
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}
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ch <- prometheus.MustNewConstMetric(
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pgReplicationSlotIsActiveDesc,
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prometheus.GaugeValue, float64(isActiveValue), slotName,
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)
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}
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if err := rows.Err(); err != nil {
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return err
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}
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return nil
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}
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