PgBouncer: add prepared statement statistics - #24607
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Collect the prepared statement counters PgBouncer 1.24+ exposes in SHOW STATS (client/server parse counts and bind counts) and the prepared_statements column from SHOW CLIENTS and SHOW SERVERS (1.21+), so prepared statement usage through the pooler is observable. Co-Authored-By: Fable 5 (nono) <noreply@anthropic.com>
Co-Authored-By: Fable 5 (nono) <noreply@anthropic.com>
estherk15
approved these changes
Jul 20, 2026
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What does this PR do?
Adds prepared statement metrics to the PgBouncer check:
SHOW STATS(PgBouncer 1.24+):pgbouncer.stats.{client_parse_count,server_parse_count,bind_count}_per_secondand theiravg_*gauges.SHOW CLIENTS/SHOW SERVERS(PgBouncer 1.21+):pgbouncer.clients.prepared_statementsandpgbouncer.servers.prepared_statements, collected under the existingcollect_per_client_metrics/collect_per_server_metricsoptions.On older PgBouncer versions the columns are absent and the metrics are simply not emitted. Adds a 1.24 entry to the test matrix and version-gated e2e assertions; verified against live PgBouncer 1.24.1 (values populated in transaction pooling mode with
max_prepared_statements > 0) and 1.23.1.Motivation
PgBouncer supports protocol-level named prepared statements since 1.21 and exposes usage counters since 1.24; the integration didn't collect them, leaving prepared statement behavior through the pooler invisible.
Review checklist (to be filled by reviewers)
qa/requiredif this PR needs QA validation, orqa/skip-qaif it does not. Exactly one of the two is required.backport/<branch-name>label to the PR and it will automatically open a backport PR once this one is merged