Adds metric_format_string config to Metric Aggregation rule #399
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Description
This PR adds metric_format_string optional configuration to Metric Aggregation rule. 'metric_format_string' formats match_body's metric_{metric_agg_key} value supporting both format() and %-formatted syntax.
Checklist
make test-docker
with my changes.Questions or Comments
After this gets merged, I am going to change 'percentage_format_string' of Percentage Aggregation rule to support format() syntax in addition to old %-formatted syntax to make both 'metric_format_string' and 'percentage_format_string' have consistency.