Update quay.io/prometheuscommunity/postgres-exporter Docker tag to v0.20.0

v0.20.0: 0.20.0 / 2026-06-29

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BREAKING CHANGES:

Collector flag changes

The replication_slot collector has been renamed to replication_slots.
Users explicitly enabling or disabling this collector must update their flags:

• --collector.replication_slot -> --collector.replication_slots
• --no-collector.replication_slot -> --no-collector.replication_slots
  The --disable-settings-metrics flag and
  PG_EXPORTER_DISABLE_SETTINGS_METRICS environment variable have been removed.
  Use --no-collector.settings instead.

Metric name changes

The metrics previously exposed by the replication_slot collector have been
renamed to use the pg_replication_slots_ prefix. Update alerts, recording
rules, and dashboards that reference these metrics:

• pg_replication_slot_slot_current_wal_lsn -> pg_replication_slots_slot_current_wal_lsn
• pg_replication_slot_slot_confirmed_flush_lsn -> pg_replication_slots_slot_confirmed_flush_lsn
• pg_replication_slot_slot_is_active -> pg_replication_slots_slot_is_active
• pg_replication_slot_safe_wal_size_bytes -> pg_replication_slots_safe_wal_size_bytes
• pg_replication_slot_wal_status -> pg_replication_slots_wal_status

Standalone collector behavior

The settings, stat_activity, stat_archiver, stat_replication, and
replication_slots metrics now come from standalone collectors instead of the
legacy default metric map.
These metrics no longer honor --metric-prefix, no longer include deprecated
constantLabels, and are no longer disabled by --disable-default-metrics.
To stop collecting them, disable the corresponding collector explicitly with
its --no-collector.* flag.

• [CHANGE] Move pg_settings metrics to the standalone settings collector by @​ArthurSens in #​1303
• [CHANGE] Move stat_archiver metrics to a standalone collector by @​ArthurSens in #​1304
• [CHANGE] Move stat_activity metrics to a standalone collector by @​ArthurSens in #​1305
• [CHANGE] Move stat_replication metrics to a standalone collector by @​ArthurSens in #​1306
• [CHANGE] Rename replication_slot to replication_slots and move replication slot metrics to a standalone collector by @​ArthurSens in #​1307
• [ENHANCEMENT] Publish container images to GHCR and update PromCI release automation by @​roidelapluie in #​1322
• [BUGFIX] Fix duplicate pg_stat_progress_vacuum metrics for cross-database vacuums by @​steinbrueckri in #​1262
• [BUGFIX] Fix pg_settings collection when short_desc is NULL by @​jun-gradial in #​1327