chore: correct AI Gateway metric provider label and cardinality notes - #28220
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The cardinality notes in
aibridge/metrics/metrics.goassume theproviderlabel takes one of three values, and two for the key pool metrics. That was accurate when the notes were written:provideris the provider instance name, and the name defaulted to one of the three provider types aibridge supports. Instances can now be given their own names, so the label takes any configured name and the series counts scale with the number of configured providers rather than being capped at a fixed number.The monitoring docs are also updated to make clear that
provideris the provider instance name.Comments and documentation only, no behaviour change.
Follow-up to #28210.