optimize ks-istio monitoring and reduce useless metrics

[frezes]

ks-istio envoy-stats-monitor contains a lot of useless metrics, in order to reduce prometheus load, add metricRelabelings for filtering

[frezes]

/cc @junotx @hongzhouzi

[ks-ci-bot]

@frezes: GitHub didn't allow me to request PR reviews from the following users: hongzhouzi.

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In response to this:

/cc @junotx @hongzhouzi

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[junotx]

It looks good to me. @hongzhouzi please confirm it contains all metrics used by istio or servicemesh module
/cc @hongzhouzi

[ks-ci-bot]

@junotx: GitHub didn't allow me to request PR reviews from the following users: hongzhouzi.

Note that only kubesphere members and repo collaborators can review this PR, and authors cannot review their own PRs.

In response to this:

It looks good to me. @hongzhouzi please confirm it contains all metrics used by istio or servicemesh module, and whether the sevicemonitor does contain some useless metrics
/cc @hongzhouzi

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[pixiake]

/cherrypick release-3.3

[ks-ci-bot]

@pixiake: once the present PR merges, I will cherry-pick it on top of release-3.3 in a new PR and assign it to you.

In response to this:

/cherrypick release-3.3

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[pixiake]

/lgtm
/approve

[ks-ci-bot]

LGTM label has been added.

Git tree hash: 3a6a0ec1c4c269e0e16e3e5f978eec70bdd587cb

[ks-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: frezes, pixiake

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[ks-ci-bot]

@pixiake: new pull request created: #2018

In response to this:

/cherrypick release-3.3

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