Capture CPU and memory metrics

[itssimon]

Summary by CodeRabbit

Release Notes

• New Features
  • System now monitors and reports CPU and memory usage metrics to provide visibility into resource consumption.

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[coderabbitai]

Walkthrough

This change introduces resource monitoring capabilities to the Apitally client library. A new ResourceMonitor class, powered by the OSHI library, captures CPU and memory usage metrics. These metrics are packaged into a new ResourceUsage DTO and integrated into the sync data payload sent by ApitallyClient. The Maven dependency is updated to include OSHI, and tests validate the monitoring behavior.

Changes

Cohort / File(s)	Summary
Dependency Management pom.xml	Added OSHI library dependency (v6.9.2) for OS-level system metrics.
Resource Monitoring Framework src/main/java/io/apitally/common/ResourceMonitor.java, src/main/java/io/apitally/common/dto/ResourceUsage.java	Introduced ResourceMonitor class to track CPU and memory usage with delta calculation. Created immutable ResourceUsage DTO with JSON serialization for cpu_percent and memory_rss fields.
Client Integration src/main/java/io/apitally/common/ApitallyClient.java, src/main/java/io/apitally/common/dto/SyncData.java	Added resourceMonitor field to ApitallyClient and initialized it in the constructor. Extended SyncData to accept and serialize ResourceUsage metrics in sync payloads.
Test Suite src/test/java/io/apitally/common/ResourceMonitorTest.java	Added unit test validating that ResourceMonitor.getCpuMemoryUsage() returns null on first call, then valid resource metrics on subsequent calls.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Capture CPU and memory metrics' directly and accurately summarizes the main change: adding CPU and memory monitoring capability via ResourceMonitor class and ResourceUsage DTO.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch simon/dev-34-capture-cpu-and-memory-metrics-in-java-sdk

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[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.87%. Comparing base (28f8a88) to head (dc0c905).

Files with missing lines	Patch %	Lines
.../main/java/io/apitally/common/ResourceMonitor.java	75.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #54      +/-   ##
============================================
+ Coverage     78.76%   78.87%   +0.11%     
- Complexity      355      362       +7     
============================================
  Files            34       36       +2     
  Lines          1276     1302      +26     
  Branches        162      164       +2     
============================================
+ Hits           1005     1027      +22     
- Misses          187      190       +3     
- Partials         84       85       +1     

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