refine the cron ehpa to single metric for multiple crons #227
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What type of PR is this?
Feature
What this PR does / why we need it:
Now, cron has some flaws if only specified one cron, then if the time is not in cron start and end, the metric will be default 1. it is unexpected for users.
Mapping many crons in one ehpa to only one metric, put many cron compare logic in metric-adapter to solve this problem.
Which issue(s) this PR fixes:
Fixes #226
Special notes for your reviewer: