[KAFKA-17161] REST Jersey metric names are inconsistent

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 3.6.2
• Component/s: core
• Assignee: Sathishkumar Manimoorthy
• Reporter: Doug Hoard
• Created: 18/Jul/24 14:43
• Updated: 22/Jul/24 16:55

Description

Summary

When exporting JMX metrics from a server, REST Jersey metric names are inconsistent, resulting in two metrics different metrics with the same value.

v3.topics-partitions-reassignment.list.request-total
v3.topics.partitions-reassignment.list.request-total

Dash versus period (.) between topics and partitions

This most likely affects older versions.

Test scenario

Install Kafka 3.6.2 with the Prometheus JMX Exporter v1.0.1 and collect metrics. The exporter adds a label "_objectname" for metrics that map to the same Prometheus name.

Example exporter output

# HELP kafka_rest_jersey_metrics_v3_topics_partitions_reassignment_list_request The request count using a cumulative counter kafka.rest:name=null,type=jersey-metrics,attribute=v3.topics.partitions-reassignment.list.request-total
# TYPE kafka_rest_jersey_metrics_v3_topics_partitions_reassignment_list_request untyped
kafka_rest_jersey_metrics_v3_topics_partitions_reassignment_list_request{_objectname="kafka.rest<type=jersey-metrics><>v3.topics-partitions-reassignment.list.request-total"} 0.0
kafka_rest_jersey_metrics_v3_topics_partitions_reassignment_list_request{_objectname="kafka.rest<type=jersey-metrics><>v3.topics.partitions-reassignment.list.request-total"} 0.0