[feat][monitor] PIP-223: Add metrics for all rest endpoints.

[dao-jun]

PIP: https://github.com/apache/pulsar/issues/18560

Motivation

https://github.com/apache/pulsar/issues/18560

Modifications

Verifying this change

• [ ] Make sure that the change passes the CI checks.

(Please pick either of the following options)

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

(or)

This change 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 deployment with large payloads (10MB)
• Extended integration test for recovery after broker failure

Does this pull request potentially affect one of the following parts:

If the box was checked, please highlight the changes

• [ ] Dependencies (add or upgrade a dependency)
• [ ] The public API
• [ ] The schema
• [ ] The default values of configurations
• [ ] The threading model
• [ ] The binary protocol
• [ ] The REST endpoints
• [ ] The admin CLI options
• [x] The metrics
• [ ] Anything that affects deployment

Documentation

• [ ] doc
• [x] doc-required
• [ ] doc-not-needed
• [ ] doc-complete

Matching PR in forked repository

PR in forked repository: https://github.com/dao-jun/pulsar/pull/6

[dao-jun]

refers to: https://github.com/apache/pulsar/pull/18836

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 86.79245% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 73.59%. Comparing base (bbc6224) to head (e139404). Report is 19 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #21772      +/-   ##
============================================
+ Coverage     73.57%   73.59%   +0.01%     
+ Complexity    32624    32153     -471     
============================================
  Files          1877     1878       +1     
  Lines        139502   139603     +101     
  Branches      15299    15321      +22     
============================================
+ Hits         102638   102737      +99     
+ Misses        28908    28878      -30     
- Partials       7956     7988      +32     

Flag	Coverage Δ
inttests	26.43% <3.77%> (+1.85%)	:arrow_up:
systests	24.31% <3.77%> (-0.02%)	:arrow_down:
unittests	72.84% <86.79%> (+<0.01%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...org/apache/pulsar/broker/ServiceConfiguration.java	99.39% <100.00%> (+<0.01%)	:arrow_up:
.../java/org/apache/pulsar/broker/web/WebService.java	94.21% <100.00%> (+0.06%)	:arrow_up:
...e/pulsar/broker/web/RestEndpointMetricsFilter.java	85.71% <85.71%> (ø)

... and 74 files with indirect coverage changes

[asafm]

@dao-jun I'm trying to find a more elegant way to obtain the path template in Jersey DEV mailing list: https://www.eclipse.org/lists/jersey-dev/msg00370.html

[asafm]

@dao-jun Ping me when you the PR is ready to continue review.

[dao-jun]

@asafm I've updated the PR, PTAL

[dao-jun]

@dragosvictor Could you please take a look that why my test keeps failing?