metrics: rework metrics implementation #3658
Merged
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Dropping support for all types except json and yaml. No more xpath
support.
Fixes #3572
β I have followed the Contributing to DVC checklist.
π If this PR requires documentation updates, I have created a separate PR (or issue, at least) in dvc.org and linked it here. If the CLI API is changed, I have updated tab completion scripts.
@dmpetrov agreed to provide docs PR for this. π
Thank you for the contribution - we'll try to review it as soon as possible. π