[feat][broker] PIP-264: Add OpenTelemetry managed ledger metrics

[dragosvictor]

PIP-264

Motivation

Adds Managed Ledger metrics, as currently described here, to the OpenTelemetry pipeline.

Modifications

• Adds the metrics described in https://github.com/apache/pulsar-site/pull/930 to the collector runs.

Verifying this change

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

This change modified tests and can be verified as follows:

• Updated test ManagedLedgerMetricsTest#testManagedLedgerMetrics to cover the OpenTelemetry metrics

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

• [ ] 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: As described in https://github.com/apache/pulsar-site/pull/930
• [ ] Anything that affects deployment

Documentation

• [ ] doc
• [x] doc-required https://github.com/apache/pulsar-site/pull/930
• [ ] doc-not-needed
• [ ] doc-complete

Matching PR in forked repository

PR in forked repository: https://github.com/dragosvictor/pulsar/pull/35

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 98.03922% with 2 lines in your changes missing coverage. Please review.

Project coverage is 73.45%. Comparing base (bbc6224) to head (97db472). Report is 427 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #22987      +/-   ##
============================================
- Coverage     73.57%   73.45%   -0.12%     
- Complexity    32624    33287     +663     
============================================
  Files          1877     1909      +32     
  Lines        139502   143054    +3552     
  Branches      15299    15578     +279     
============================================
+ Hits         102638   105080    +2442     
- Misses        28908    29943    +1035     
- Partials       7956     8031      +75     

Flag	Coverage Δ
inttests	27.74% <98.03%> (+3.16%)	:arrow_up:
systests	24.75% <47.05%> (+0.42%)	:arrow_up:
unittests	72.47% <98.03%> (-0.37%)	:arrow_down:

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

Files	Coverage Δ
...he/bookkeeper/mledger/ManagedLedgerAttributes.java	100.00% <100.00%> (ø)
...kkeeper/mledger/impl/ManagedLedgerFactoryImpl.java	82.03% <100.00%> (+0.64%)	:arrow_up:
...ookkeeper/mledger/impl/ManagedLedgerMBeanImpl.java	90.34% <100.00%> (+0.63%)	:arrow_up:
.../mledger/impl/OpenTelemetryManagedLedgerStats.java	100.00% <100.00%> (ø)
.../pulsar/opentelemetry/OpenTelemetryAttributes.java	100.00% <100.00%> (ø)
...a/org/apache/bookkeeper/mledger/ManagedLedger.java	0.00% <0.00%> (ø)
...che/bookkeeper/mledger/impl/ManagedLedgerImpl.java	81.33% <80.00%> (+0.67%)	:arrow_up:

... and 476 files with indirect coverage changes