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docs: document Micrometer name and tag usage - #4437
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Signed-off-by: Arnab Nandy <arnab_nandy7@yahoo.com>
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Documents how the
name()andtag()operators affect metrics generated byreactor-core-micrometer.Clarifies that
Micrometer.metrics()uses the upstream sequence name as the meter-name prefix and adds upstream tags to generated meters. Also warns against high-cardinality names and tag values because they can increaseMeterRegistrymemory usage and monitoring-system data volume.Fixes #4270.