[exporter/prometheusremotewriteexporter] Do not modify attributes Map in prometheusRW #9736
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Description:
Modifying data in the prometheus remote write causes a race when more
than one exporters is accessing data.
To avoid this, all operations are done on cloned data.
Link to tracking Issue: #9727
Testing:
I have executed the reproduction steps described in the bug report. With the fix the panic is not occurring anymore.
Documentation:
Added inline comment about the change as this is not self-explanatory.