prometheus/postgres_exporter
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Include all idle processes in the process idle metrics

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Signed-off-by: Tom Hughes <tom@compton.nu>
This commit is contained in:
Tom Hughes
2023-07-04 11:14:36 +01:00
parent 6b56e2f057
commit a8b86cf7da
1 changed files with 18 additions and 9 deletions
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27
collector/pg_process_idle.go
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@@ -40,7 +40,7 @@ func NewPGProcessIdleCollector(config collectorConfig) (Collector, error) {
var pgProcessIdleSeconds = prometheus.NewDesc(
prometheus.BuildFQName(namespace, processIdleSubsystem, "seconds"),
"Idle time of server processes",
[]string{"application_name"},
[]string{"state", "application_name"},
prometheus.Labels{},
)
@@ -50,15 +50,17 @@ func (PGProcessIdleCollector) Update(ctx context.Context, instance *instance, ch
`WITH
metrics AS (
SELECT
state,
application_name,
SUM(EXTRACT(EPOCH FROM (CURRENT_TIMESTAMP - state_change))::bigint)::float AS process_idle_seconds_sum,
COUNT(*) AS process_idle_seconds_count
FROM pg_stat_activity
WHERE state = 'idle'
GROUP BY application_name
WHERE state ~ '^idle'
GROUP BY state, application_name
),
buckets AS (
SELECT
state,
application_name,
le,
SUM(
@@ -70,25 +72,27 @@ func (PGProcessIdleCollector) Update(ctx context.Context, instance *instance, ch
FROM
pg_stat_activity,
UNNEST(ARRAY[1, 2, 5, 15, 30, 60, 90, 120, 300]) AS le
GROUP BY application_name, le
ORDER BY application_name, le
GROUP BY state, application_name, le
ORDER BY state, application_name, le
)
SELECT
state,
application_name,
process_idle_seconds_sum as seconds_sum,
process_idle_seconds_count as seconds_count,
ARRAY_AGG(le) AS seconds,
ARRAY_AGG(bucket) AS seconds_bucket
FROM metrics JOIN buckets USING (application_name)
GROUP BY 1, 2, 3;`)
FROM metrics JOIN buckets USING (state, application_name)
GROUP BY 1, 2, 3, 4;`)
var state sql.NullString
var applicationName sql.NullString
var secondsSum sql.NullFloat64
var secondsCount sql.NullInt64
var seconds []float64
var secondsBucket []int64
err := row.Scan(&applicationName, &secondsSum, &secondsCount, pq.Array(&seconds), pq.Array(&secondsBucket))
err := row.Scan(&state, &applicationName, &secondsSum, &secondsCount, pq.Array(&seconds), pq.Array(&secondsBucket))
if err != nil {
return err
}
@@ -101,6 +105,11 @@ func (PGProcessIdleCollector) Update(ctx context.Context, instance *instance, ch
buckets[second] = uint64(secondsBucket[i])
}
stateLabel := "unknown"
if state.Valid {
stateLabel = state.String
}
applicationNameLabel := "unknown"
if applicationName.Valid {
applicationNameLabel = applicationName.String
@@ -117,7 +126,7 @@ func (PGProcessIdleCollector) Update(ctx context.Context, instance *instance, ch
ch <- prometheus.MustNewConstHistogram(
pgProcessIdleSeconds,
secondsCountMetric, secondsSumMetric, buckets,
applicationNameLabel,
stateLabel, applicationNameLabel,
)
return nil
}