Extract MetricsClient and NodeMetrics to support other metrics platform

[shoothzj]

see #2679 for more details

[wangyang0616]

@shoothzj Thank you for your contribution.

It will be more beneficial for everyone to review if you can add a PR description, such as the background, reason and goal of this PR, etc.

If there is a corresponding issue, you can also directly associate it.

[wangyang0616]

When the architecture is updated, it is best to update the design documents synchronously usage-based-scheduling.md

[shoothzj]

@wangyang0616 I have already created a ticket (#2679) to track this enhancement. I suggest that we don't update the document in this pull request. Instead, I prefer to update the document when step 2 is implemented, which involves the introduction of the "metrics.type" variable.
WDYT? thanks for advance.

[wangyang0616]

@wangyang0616 I have already created a ticket (#2679) to track this enhancement. I suggest that we don't update the document in this pull request. Instead, I prefer to update the document when step 2 is implemented, which involves the introduction of the "metrics.type" variable. WDYT? thanks for advance.

This is very good. By the way, is it better to add a folder under the cache directory to store the newly added metrics files, such as refermetrics, the metrics obtained from other platforms can also be placed in this folder uniformly.

[shoothzj]

@wangyang0616 Hi, if no other concern, can we merge this?

[wangyang0616]

It's ok in my opinion.
cc @william-wang @Thor-wl

[wangyang0616]

/lgtm

[Thor-wl]

It's ok in my opinion.
cc @william-wang @Thor-wl

I'm sorry for the late reply. Since I'm a little bit busy recently, will reivew recent PRs and issues together sometime this weekend.

[william-wang]

@shoothzj Thanks for your contribution. I will take a look as soon as possible:)

[william-wang]

/lgtm

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[jiangkaihua]

/lgtm