Normalize namespace and metric names. #747
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According to the documentation https://docs.datadoghq.com/metrics/custom_metrics/#naming-custom-metrics metric names contain only ASCII alphanumerics, underscores, and periods, while other characters are converted to underscores. This commit ensures we replace all invalid characters with underscores for both namespaces and metric names. A similar thing has been already done for tags in DataDog#489 and DataDog#517, so I followed the example. It solves DataDog#740.
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What does this PR do?
According to the documentation metric names contain only ASCII alphanumerics, underscores, and periods, while other characters are converted to underscores.
Invalid names can lead to malformed dogstatsd packets being created.
It solves #740.
Description of the Change
This commit ensures we replace all invalid characters with underscores for both namespaces and metric names.
A similar thing has been already done for tags in #489 and #517, so I followed the example.
Possible Drawbacks
Performance cost due to string manipulation - partially addressed by using cache.
Verification Process
Tested manually. Added unit tests.
Release Notes
If some metrics with invalid names were successfully pushed, this might impose backward incompatibility.
Review checklist (to be filled by reviewers)
changelog/label attached. If applicable it should have thebackward-incompatiblelabel attached.do-not-merge/label attached.kind/andseverity/labels attached at least.