Using negative lookahead in jmx-exporter pattern

[Kaloyan Simitchiyski]

Hi folks,

I'm using the jmx-exporter to collect metrics from Kafka brokers. However, I'm having a bit of trouble with a particular regex pattern:

- pattern: kafka.network<type=RequestMetrics, name=ErrorsPerSec, request=(.+), error=(^(?!NONE$).*)><>Count

    name: kafka_request_errors_total

    type: COUNTER

    cache: true

    labels:

        request: "$1"

        error: "$2"

I want to collect every sample except in the cases when the error attribute is NONE. The rule does not seem to work as the jmx-exporter stops returning the metric altogether. If I change the pattern to error=(.+) it works just fine.

Have you guys done something similar? Is something wrong with my approach?

[Brian Brazil]

The ^ and $ are anchoring to the whole line, so that can never match. Try without them.

Brian

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[Kaloyan Simitchiyski]

Hi Brian,

Makes sense why it didn't work... Everything is fine now. Thanks!