docs: pipeline: outputs: prometheus_remote_write: document stale metric expiration - #2682
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📝 WalkthroughWalkthroughThe Prometheus remote-write documentation now describes one-hour stale metric expiration during flushes, including stale filesystem-buffer and archive-replayed metrics. ChangesPrometheus stale metric expiration
Estimated code review effort: 1 (Trivial) | ~2 minutes Merge Risk: ⚪ Minimal · up to The documentation currently overstates stale-data loss by implying entire backlogs or archive replays are discarded; only metrics older than one hour are dropped. This is a localized wording issue with minimal merge risk and should be corrected before or shortly after merge. Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@pipeline/outputs/prometheus-remote-write.md`:
- Line 48: Update the recovery example in the Prometheus remote-write
documentation to clarify that only metrics older than the fixed one-hour cutoff
are dropped; newer metrics in filesystem-buffer backlogs or archive replays
remain eligible for delivery.
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pipeline/outputs/prometheus-remote-write.md
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…ic expiration
Document the one-hour staleness cut-off added to the Prometheus remote
write output plugin in fluent-bit d46750cbb.
- Add a Stale metric expiration section explaining that each flush drops
metrics with a timestamp more than one hour old before the remote write
payload is built, because backends reject stale samples and one
rejected sample fails the whole request
- Note that expiration is evaluated per label set, so an idle time series
is dropped while actively updated series of the same metric are still
sent
- Note that the cut-off is fixed at one hour and can't be configured, and
that expired metrics are dropped without an error
- Call out the practical consequence: a backlog recovered from filesystem
buffering after an outage longer than an hour, or a replay from an
archive, doesn't reach the backend
- Clarify backlog expiration scope
Signed-off-by: Eric D. Schabell <eric@schabell.org>
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Document the one-hour staleness cut-off added to the Prometheus remote
write output plugin in fluent-bit d46750cbb.
metrics with a timestamp more than one hour old before the remote write
payload is built, because backends reject stale samples and one
rejected sample fails the whole request
is dropped while actively updated series of the same metric are still
sent
that expired metrics are dropped without an error
buffering after an outage longer than an hour, or a replay from an
archive, doesn't reach the backend
Signed-off-by: Eric D. Schabell eric@schabell.org
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