fix: always add instance-id for built-in metrics #3612
Merged
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The instance-id was only added for built-in metrics when the headers of the request was sent. This meant that any request that would NOT get sent would not include an instance-id, which again would cause the export of ALL built-in metrics to stop. This would happen because the metric without an instance-id would remain in the collected metrics.
A request would get into this state if the client ran into a network issue that would prevent the client from making a network connection to Spanner.
Fixes #3611