[Bug]: observable counters and up-down counters always report all historical label set

[Yamakaky]

What happened?

This seems very similar to #2213.

I have an observable counter for bytes sent/received for my TCP server, with a dynamic label for the client IP/port. As with the linked bug, the last value for each ip/port gets reported, instead of only the current observed values.

Note that the MR for the linked bug seems to be working, since I can't reproduce the bug with observable gauges.

OpenTelemetry API Version (i.e version of opentelemetry crate)

0.31

OpenTelemetry SDK Version (i.e version of opentelemetry_sdk crate)

0.31

What Exporter(s) are you seeing the problem on?

OTLP

Relevant log output

Tip

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