[Resources.Process] Add process.creation.time

[martincostello]

Contributes to #1515.

Changes

Collect new attribute based on v1.41.0 of the semantic conventions:

• process.args_count
• process.command
• process.creation.time
• process.executable.path
• process.title
• process.working_directory

Based on Selecting process attributes, I went with process.executable.path as it can be used to derive process.executable.name, and process.args_count so that we do not need to implement redaction for process.command_line and/or process.command_args.

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.47%. Comparing base (26a1dc7) to head (b522dc6).
⚠️ Report is 7 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...OpenTelemetry.Resources.Process/ProcessDetector.cs	87.50%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4036      +/-   ##
==========================================
- Coverage   76.04%   73.47%   -2.58%     
==========================================
  Files         466      454      -12     
  Lines       18695    17588    -1107     
==========================================
- Hits        14217    12922    -1295     
- Misses       4478     4666     +188     

Flag	Coverage Δ
unittests-Instrumentation.Cassandra	?
unittests-Resources.Process	90.47% <87.50%> (-9.53%)	⬇️

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

Files with missing lines	Coverage Δ
...OpenTelemetry.Resources.Process/ProcessDetector.cs	89.47% <87.50%> (-10.53%)	⬇️

... and 110 files with indirect coverage changes

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[Copilot]

Pull request overview

Adds additional OpenTelemetry process resource attributes to align OpenTelemetry.Resources.Process with semantic conventions v1.40.0.

Changes:

• Add semantic convention keys for process.executable.path and process.args_count.
• Extend ProcessDetector to emit executable path and argument count attributes.
• Update unit test to assert the presence/types of the new attributes and bump expected attribute count.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
test/OpenTelemetry.Resources.Process.Tests/ProcessDetectorTests.cs	Updates assertions to cover the two new process attributes.
src/OpenTelemetry.Resources.Process/ProcessSemanticConventions.cs	Adds constants for the new semantic convention attribute names.
src/OpenTelemetry.Resources.Process/ProcessDetector.cs	Implements collection of executable path and args count.
src/OpenTelemetry.Resources.Process/CHANGELOG.md	Documents the new attributes (currently with a placeholder PR link).

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[Kielek]

@martincostello, can you check executing this detector with ./MyApp vs dotnet MyApp.dll?
Are the attributes correct for both cases?

[martincostello]

These are the results. Looks like process.command is wrong, and thus process.args_count.

dotnet run

process.owner=marti
process.pid=176192
process.working_directory=D:\Coding\open-telemetry\opentelemetry-dotnet-contrib\examples\process-instrumentation
process.creation.time=2026-04-07T11:00:22.4389323+01:00
process.command=D:\Coding\open-telemetry\opentelemetry-dotnet-contrib\artifacts\bin\process-instrumentation\debug\process-instrumentation.dll
process.args_count=0
process.executable.path=D:\Coding\open-telemetry\opentelemetry-dotnet-contrib\artifacts\bin\process-instrumentation\debug\process-instrumentation.exe
telemetry.sdk.name=opentelemetry
telemetry.sdk.language=dotnet
telemetry.sdk.version=1.15.1
service.name=unknown_service:process-instrumentation

dotnet foo.dll

process.owner=marti
process.pid=148100
process.working_directory=D:\Coding\open-telemetry\opentelemetry-dotnet-contrib\artifacts\bin\process-instrumentation\debug
process.creation.time=2026-04-07T11:00:02.6171738+01:00
process.command=D:\Coding\open-telemetry\opentelemetry-dotnet-contrib\artifacts\bin\process-instrumentation\debug\process-instrumentation.dll
process.args_count=0
process.executable.path=C:\Program Files\dotnet\dotnet.exe
telemetry.sdk.name=opentelemetry
telemetry.sdk.language=dotnet
telemetry.sdk.version=1.15.1
service.name=unknown_service:dotnet

foo.exe

process.owner=marti
process.pid=177708
process.working_directory=D:\Coding\open-telemetry\opentelemetry-dotnet-contrib\artifacts\bin\process-instrumentation\debug
process.creation.time=2026-04-07T10:59:42.2029624+01:00
process.command=D:\Coding\open-telemetry\opentelemetry-dotnet-contrib\artifacts\bin\process-instrumentation\debug\process-instrumentation.dll
process.args_count=0
process.executable.path=D:\Coding\open-telemetry\opentelemetry-dotnet-contrib\artifacts\bin\process-instrumentation\debug\process-instrumentation.exe
telemetry.sdk.name=opentelemetry
telemetry.sdk.language=dotnet
telemetry.sdk.version=1.15.1
service.name=unknown_service:process-instrumentation

[martincostello]

@Kielek I removed process.command.

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 7 days.

[lachmatt]

@martincostello it seems requirement level recently changed for some of the attributes this PR adds: https://github.com/open-telemetry/semantic-conventions/blob/v1.41.0/docs/resource/process.md
Can you take a look and update it accordingly?

[martincostello]

@lachmatt Done - this reduces the PR to just adding process.creation.time.