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addressing comments

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Signed-off-by: Zachary Caldarola <zachary.caldarola@reddit.com>
This commit is contained in:
Zachary Caldarola 2023-01-25 11:15:24 -05:00
parent 300750001c
commit 9b13780d14
1 changed files with 20 additions and 9 deletions
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29
collector/pg_replication_slots.go
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@ -1,4 +1,4 @@
// Copyright 2022 The Prometheus Authors
// 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
@ -34,9 +34,14 @@ func NewPGReplicationSlotCollector(logger log.Logger) (Collector, error) {
}
var pgReplicationSlot = map[string]*prometheus.Desc{
"lsn_distance": prometheus.NewDesc(
"pg_replication_slot_lsn_distance",
"Disk space used by the database",
"current_wal_lsn": prometheus.NewDesc(
"pg_replication_slot_current_wal_lsn",
"current wal lsn value",
[]string{"slot_name"}, nil,
),
"confirmed_flush_lsn": prometheus.NewDesc(
"pg_replication_slot_confirmed_flush_lsn",
"last lsn confirmed flushed to the replication slot",
[]string{"slot_name"}, nil,
),
}
@ -45,7 +50,8 @@ func (PGReplicationSlotCollector) Update(ctx context.Context, db *sql.DB, ch cha
rows, err := db.QueryContext(ctx,
`SELECT
slot_name,
(pg_current_wal_lsn() - confirmed_flush_lsn) AS lsn_distance
pg_current_wal_lsn() AS current_wal_lsn,
confirmed_flush_lsn
FROM
pg_replication_slots;`)
if err != nil {
@ -55,14 +61,19 @@ func (PGReplicationSlotCollector) Update(ctx context.Context, db *sql.DB, ch cha
for rows.Next() {
var slot_name string
var size int64
if err := rows.Scan(&slot_name, &size); err != nil {
var wal_lsn int64
var flush_lsn int64
if err := rows.Scan(&slot_name, &wal_lsn, &flush_lsn); err != nil {
return err
}
ch <- prometheus.MustNewConstMetric(
pgReplicationSlot["size_bytes"],
prometheus.GaugeValue, float64(size), slot_name,
pgReplicationSlot["current_wal_lsn"],
prometheus.GaugeValue, float64(wal_lsn), slot_name,
)
ch <- prometheus.MustNewConstMetric(
pgReplicationSlot["confirmed_flush_lsn"],
prometheus.GaugeValue, float64(flush_lsn), slot_name,
)
}
if err := rows.Err(); err != nil {