[jira] [Created] (FLINK-11251) Incompatible metric name on prometheus reporter

["Wei-Che Wei (JIRA)" <ji...@apache.org>]

Wei-Che Wei created FLINK-11251:
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             Summary: Incompatible metric name on prometheus reporter
                 Key: FLINK-11251
                 URL: https://issues.apache.org/jira/browse/FLINK-11251
             Project: Flink
          Issue Type: Bug
          Components: Metrics
    Affects Versions: 1.7.0, 1.6.3, 1.5.6
            Reporter: Wei-Che Wei
            Assignee: Wei-Che Wei


{code}
# HELP flink_taskmanager_job_task_operator_KafkaConsumer_topic_partition_4_currentOffsets currentOffsets (scope: taskmanager_job_task_operator_KafkaConsumer_topic_partition_4)
# TYPE flink_taskmanager_job_task_operator_KafkaConsumer_topic_partition_4_currentOffsets gauge
flink_taskmanager_job_task_operator_KafkaConsumer_topic_partition_4_currentOffsets{task_attempt_id="5137e35cf7319787f6cd627621fd2ea7",host="localhost",task_attempt_num="0",tm_id="e72a527652f5af1358bdbc0f5bf6f49d",partition="4",topic="rt_lookback_state",job_id="546cf6f0d1f0b818afd9697c612f715c",task_id="d7b1ad914351f9ee5272ffff67f51160",operator_id="d7b1ad914351f9ee5272ffff67f51160",operator_name="Source:_kafka_lookback_state_source",task_name="Source:_kafka_lookback_state_source",job_name="FlinkRuleMatchPipeline",subtask_index="7",} 1.456090927E9
# HELP flink_taskmanager_job_task_operator_KafkaConsumer_topic_partition_24_committedOffsets committedOffsets (scope: taskmanager_job_task_operator_KafkaConsumer_topic_partition_24)
# TYPE flink_taskmanager_job_task_operator_KafkaConsumer_topic_partition_24_committedOffsets gauge
flink_taskmanager_job_task_operator_KafkaConsumer_topic_partition_24_committedOffsets{task_attempt_id="9b666af68ec4734b25937b8b94cc5c84",host="localhost",task_attempt_num="0",tm_id="e72a527652f5af1358bdbc0f5bf6f49d",partition="24",topic="rt_event",job_id="546cf6f0d1f0b818afd9697c612f715c",task_id="61252f73469d3ffba207c548d29a0267",operator_id="61252f73469d3ffba207c548d29a0267",operator_name="Source:_kafka_source",task_name="Source:_kafka_source____sampling____parse_and_filter",job_name="FlinkRuleMatchPipeline",subtask_index="27",} 3.001186523E9
{code}

This is a snippet from my flink prometheus reporter. It showed that kafka current offsets and committed offsets metric names changed after I migrated my flink job from 1.6.0 to 1.6.3.

The origin metrics name should not contain {{partition index}} in metric name, i.e. the metric name should be {{flink_taskmanager_job_task_operator_KafkaConsumer_topic_partition_currentOffsets}} and {{flink_taskmanager_job_task_operator_KafkaConsumer_topic_partition_committedOffsets}}.

After digging into the source code, I found that the incompatibility started from this [PR|https://github.com/apache/flink/pull/7095], because it overloaded a new {{getLogicalScope(CharacterFilter, char, int)}} and didn't override in {{GenericValueMetricGroup}} class.
When the tail metric group from a metric is {{GenericValueMetricGroup}} and this new {{getLogicalScope}} is called, i.e. calling {{FrontMetricGroup#getLogicalScope}}, the value group name will not be ignored, but it should be in previous released version.




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