[resource_detectors] implementation of process resource detector as per semconv

[nikhilbhatia08]

Fixes # (issue)

Changes

Implements process detector currently for attributes - [process.pid, process.executable.path, process.command], the next pull request will implement more of the process attributes. Added tests.

reference - https://github.com/open-telemetry/semantic-conventions/blob/main/docs/resource/process.md#selecting-process-attributes

Please provide a brief description of the changes here.

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.03%. Comparing base (42050d0) to head (66c4b49).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3591   +/-   ##
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  Coverage   90.03%   90.03%           
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  Files         220      220           
  Lines        7069     7069           
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  Hits         6364     6364           
  Misses        705      705           

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[Copilot]

Pull Request Overview

This PR implements a process resource detector for OpenTelemetry that extracts process-related attributes according to semantic conventions. It adds functionality to detect process ID, executable path, and command line information for the current process.

• Adds ProcessResourceDetector class that implements the ResourceDetector interface
• Implements utility functions for cross-platform process information extraction (Windows/Unix)
• Provides comprehensive test coverage for the new functionality

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
resource_detectors/include/opentelemetry/resource_detectors/process_detector.h	Defines the ProcessResourceDetector class interface
resource_detectors/include/opentelemetry/resource_detectors/process_detector_utils.h	Declares utility functions for process information extraction
resource_detectors/process_detector.cc	Implements the main ProcessResourceDetector functionality
resource_detectors/process_detector_utils.cc	Implements cross-platform process information extraction utilities
resource_detectors/test/process_detector_test.cc	Adds unit tests for the process detector utilities
resource_detectors/test/CMakeLists.txt	Updates test build configuration to include new test file
resource_detectors/test/BUILD	Updates Bazel build configuration for tests
resource_detectors/CMakeLists.txt	Updates library build configuration to include new source files
resource_detectors/BUILD	Updates Bazel build configuration for the library

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[nikhilbhatia08]

The tests on the latest commit fail because psapi.h is included first and then windows.h, but if we try to include windows.h first and then include psapi.h then it would fail the format test. What can be done for this any suggestions ?

[lalitb]

The tests on the latest commit fail because psapi.h is included first and then windows.h, but if we try to include windows.h first and then include psapi.h then it would fail the format test. What can be done for this any suggestions ?

What is the format error? You switch off the clang/iwyu check for that portion of the include, depending on the error you are getting.

[nikhilbhatia08]

If I run format of ci then I'm getting this error

The following files have changes:
resource_detectors/process_detector_utils.cc
diff --git a/resource_detectors/process_detector_utils.cc b/resource_detectors/process_detector_utils.cc
index cb6e064..d20f367 100644
--- a/resource_detectors/process_detector_utils.cc
+++ b/resource_detectors/process_detector_utils.cc
@@ -7,8 +7,8 @@
 #include <string>
 
 #ifdef _MSC_VER
-#  include <windows.h>
 #  include <psapi.h>
+#  include <windows.h>
 #else
 #  include <sys/types.h>
 #  include <unistd.h>

So if I include psapi.h first and then windows.h, the windows.h header redefines some macros present in psapi.h, that is why windows.h should be included first, but doing so gives the above format error.

But now I got how to disable the format error for this part of code. Thanks 👍🏻 !

[dbarker]

Thanks for the PR! Please see comments above.

[nikhilbhatia08]

For the tests added now and resource detectors tests in general we need to enable the tests -DWITH_RESOURCE_DETECTORS_PREVIEW=ON or else they will go untested as the actions ran in the previous commit.

[dbarker]

Looks good. Thanks!

[lalitb]

PR looks good, just requesting change for this - as it can lead to crash.