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https://issues.apache.org/jira/browse/KAFKA-1902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14294289#comment-14294289
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Jun Rao commented on KAFKA-1902:
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In Kafka, topic/group/clientId can include only -, _ and dot, in addition to
alpha numerics. The problem of replacing dot with - or _ is that looking at the
scope string, you don't know if a - or _ is originally there or not. Some users
may find preserving that info useful.
> fix MetricName so that Yammer reporter can work correctly
> ---------------------------------------------------------
>
> Key: KAFKA-1902
> URL: https://issues.apache.org/jira/browse/KAFKA-1902
> Project: Kafka
> Issue Type: Bug
> Components: core
> Reporter: Jun Rao
> Assignee: Jun Rao
> Priority: Blocker
> Fix For: 0.8.2
>
> Attachments: kafka-1902.patch
>
>
> Currently, we create MetricName in the following format.
> group: "kafka.server"
> type: "BrokerTopicMetrics"
> name: "BytesInPerSec"
> scope: null
> mBeanName:
> "kafka.server:type=BrokerTopicMetrics,name=BytesInPerSec,topic=test"
> However, Yammer metric reporter seems to only use the first four fields
> group, type, name and scope during reporting.
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