Fix dimension names and documentation for metrics with prior prometheus support

[namannandan]

Description

For metrics with prior prometheus support, i.e:

• ts_inference_requests_total
• ts_inference_latency_microseconds
• ts_queue_latency_microseconds

ensure that the dimension names match what was setup earlier and also replace uuid dimension name with hostname
Updated dimension names are: ["model_name", "model_version", "hostname"]

Update metrics API endpoint docs to reflect caching metrics implementation and above dimension name updates.

Deprecate TS_METRICS_FORMAT configuration option in favor of TS_METRICS_MODE.

RFC: #1492

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Feature/Issue validation/testing

• Unit tests
  Run as part of sanity in CI

• Regression tests

  • CPU: cpu_regression_log.txt
  • GPU: gpu_regression_log.txt
    • FAILED test_sm_mme_requirements.py::test_oom_on_model_load - AssertionError: ...
    • FAILED test_sm_mme_requirements.py::test_oom_on_invoke - AssertionError: OOM ...

Checklist:

• Did you have fun?
• Have you added tests that prove your fix is effective or that this feature works?
• Has code been commented, particularly in hard-to-understand areas?
• Have you made corresponding changes to the documentation?

[codecov]

Codecov Report

Merging #2281 (64575f6) into master (d6e072a) will not change coverage.
The diff coverage is n/a.

❗ Current head 64575f6 differs from pull request most recent head f5ea97d. Consider uploading reports for the commit f5ea97d to get more accurate results

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[namannandan]

Updated dashboard screenshots in documentation:
Prometheus

Grafana