Marton Greber created KUDU-3692:
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Summary: Add table attribution to tablet metrics in
/metrics_prometheus
Key: KUDU-3692
URL: https://issues.apache.org/jira/browse/KUDU-3692
Project: Kudu
Issue Type: Sub-task
Components: metrics, Prometheus
Affects Versions: 1.18.0
Reporter: Marton Greber
In 1.18.0 the Prometheus exposition for tablet metrics (/metrics_prometheus)
does not include table attribution. Tablet IDs appear in metric names (e.g.,
kudu_tablet_<tablet_id>_live_row_count), but there are no Prometheus labels
that allow joining a tablet to its table.
In contrast, the JSON metrics (/metrics) expose attributes like table_id,
table_name, and human-readable partition info under the tablet entity.
While implementing this fix one should look into how much more work it would
take to have "label parity" with the existing json metrics that are available.
Supplementary:
Root issue reported on Slack:
"I get all the metrics per tablet. The tabletID is in the metric name (example:
kudu_tablet_d3ef3d70f47a47fc8073593c8587f58b_live_row_count).
Unfortunately, I can't find the mappings from a table_name to the tabletID in
the metric name."
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