Fix the default Metrics Collector regex

[andreyvelich]

Fixes: #1754.
I fixed the default regex format.
I will create separate PR to update the website doc.

/assign @kubeflow/wg-automl-leads
/cc @RDarrylR @anencore94

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In response to this:

Fixes: #1754.
I fixed the default regex format.
I will create separate PR to update the website doc.

/assign @kubeflow/wg-automl-leads
/cc @RDarrylR @anencore94

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[coveralls]

Coverage decreased (-0.2%) to 74.138% when pulling 3e72661 on andreyvelich:issue-1754-fix-metrics-collector-regex into bb439fa on kubeflow:master.

[anencore94]

That's my bad. Thanks so much for the fix
/lgtm