Andrew Sherman created IMPALA-13638:
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Summary: Translate apostrophe to underscore in Prometheus metric
names.
Key: IMPALA-13638
URL: https://issues.apache.org/jira/browse/IMPALA-13638
Project: IMPALA
Issue Type: Bug
Components: Backend
Affects Versions: Impala 4.4.0
Reporter: Andrew Sherman
Assignee: Andrew Sherman
Impala has some metrics that reflect the state of the JVM. Some of these
metrics have names that are partly composed of the names of the
MemoryPoolMXBean objects in the Java virtual machine. In Jdk8 these are names
like "Code Cache" and "PS Eden Space". In Jdk11 these names include apostrophe
characters, for example "CodeHeap 'profiled nmethods'". The derived metric
names work OK for Impala in both the webui and in json output. However the
apostrophe character is illegal in Prometheus metric names per
https://prometheus.io/docs/concepts/data_model/#metric-names-and-labels and
these metrics cannot be consumed by Prometheus. Fix this by adding the
apostrophe to the list of characters that are mapped to underscores when we
translate the metric names for Prometheus metrics.
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