[jira] [Created] (KUDU-3775) BuildPrometheusLabels DCHECK restricts new Prometheus label format to known entity types

["Marton Greber (Jira)" <ji...@apache.org>]

Marton Greber created KUDU-3775:
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             Summary: BuildPrometheusLabels DCHECK restricts new Prometheus label format to known entity types
                 Key: KUDU-3775
                 URL: https://issues.apache.org/jira/browse/KUDU-3775
             Project: Kudu
          Issue Type: Improvement
            Reporter: Marton Greber


BuildPrometheusLabels() in prometheus_writer.cc contains a DCHECK that
hard-codes the set of valid entity types to "server", "table", and "tablet":
 
 DCHECK(entity_type == "server" ||
 entity_type == "table" ||
 entity_type == "tablet")
 
This prevents enabling --metrics_prometheus_use_entity_labels=true for
any entity type outside this set, including synthetic test entities
(e.g. "test_entity"). As a result, unit tests for Prometheus filtering
(KUDU-3690) cannot use the new label-based format and are forced to
rely on the legacy format instead.
 
 



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