improv(metrics): avoid emitting empty EMF metric #3044
Merged
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Summary
Changes
This PR improves the Metrics utility by avoiding to log an empty metric when the buffer is flushed and no metric is present.
Before this PR the utility would log an EMF log with no metrics when attempting to flush the buffer and no metrics were set. The PR aligns the behavior with the Python version of Powertools for AWS.
Issue number: closes #3023
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