woblerr / pgbackrest_exporter / 28581272735

91%

master: 91%

Pull #123

github

Add per-repository last backup metrics.

Refs #122

Track the latest full, differential and incremental backups separately for each
repository and expose repository-scoped freshness and duration metrics:
- pgbackrest_backup_repo_since_last_completion_seconds
- pgbackrest_backup_repo_last_duration_seconds

These metrics were selected because they answer repo-specific operational
questions directly: whether each repository has a recent completed backup and
how long that last backup took. This is useful for multi-repository alerting and
dashboards without sorting or joining per-backup series.

For `pgBackRest >= v2.32` this is the real repository key.
For older pgBackRest versions, repository keys are not present in backup metadata, so the exporter
uses `repo_key="0"`, matching the existing compatibility behavior for old versions.

Other last-backup values are not duplicated per repository in this change.
Checksum/page error state is already exposed for each concrete backup via
`pgbackrest_backup_error_status` with `repo_key`, so a repo-last error metric would
duplicate data and imply a repository-level error. Size, delta, annotations,
references and database-count metrics remain global or per-backup because adding
repo variants would broaden the metric surface and cardinality beyond this
focused freshness/duration use case.

Update README, unit tests and e2e checks for the new metrics.

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