[HUDI-2267] update docs and infra test configs, add support for graphite

[data-storyteller]

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• Please review https://hudi.apache.org/contribute/how-to-contribute before opening a pull request.

What is the purpose of the pull request

• Update docs for latest changes
• Update infra test configs and scripts,
• add support for graphite to visualise the hoodie metrics

Brief change log

• Update docs for latest changes
• Update infra test configs and scripts,
• add support for graphite to visualise the hoodie metrics

Verify this pull request

This pull request is a trivial rework / code cleanup without any test coverage.

(Please pick either of the following options)

This pull request is a trivial rework / code cleanup without any test coverage.

(or)

This pull request is already covered by existing tests, such as (please describe tests).

(or)

This change added tests and can be verified as follows:

(example:)

• Added integration tests for end-to-end.
• Added HoodieClientWriteTest to verify the change.
• Manually verified the change by running a job locally.

Committer checklist

• Has a corresponding JIRA in PR title & commit

• Commit message is descriptive of the change

• CI is green

• Necessary doc changes done or have another open PR

• For large changes, please consider breaking it into sub-tasks under an umbrella JIRA.

[hudi-bot]

CI report:

• 5f4b211 UNKNOWN
• b089695 Azure: SUCCESS
• 85dbdf4 Azure: PENDING

Bot commands

@hudi-bot supports the following commands:

• @hudi-bot run travis re-run the last Travis build
• @hudi-bot run azure re-run the last Azure build

[vinothchandar]

@data-storyteller can you please make this not draft if this ready for review?

[rmahindra123]

@nsivabalan Can you finish reviewing this diff? Lets plan on landing it soon.