Backport of agent: allow configuration of in-memory telemetry sink. into release/1.7.x #20217
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Backport
This PR is auto-generated from #20166 to be assessed for backporting due to the inclusion of the label backport/1.7.x.
The below text is copied from the body of the original PR.
This change adds configuration options for setting the in-memory telemetry sink collection and retention durations. This sink backs the metrics JSON API and previously had hard-coded default values.
The new options are particularly useful when running development or debug environments, where metrics collection is desired at a fast and granular rate. This is particularly useful for gauges; currently the last value written in the interval is returned from the API. In situations with spiking/flapping data, this could mean we miss information.
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