(DynamicSelector) fixups for dynamic resource attributes

[damemi]

Summary

Some fixups from #2458 (review) (I was a little quick on the merge):

• Use deadlock safe SendCtx() instead of Send()
• Update method comment about leaking state and proper cleanup
• Cleanup stale PIDs from DynamicFlowAttrs
• Remove arbitrary resource attributes from flow metrics, which currently only export named attributes from attrs_defs (service name and namespace can still be set). maybe a follow up to add more custom attributes there in the future

Validation

• I have read and followed the contributing guidelines
• If this enhances / fixes / changes a core feature, I have updated the features documentation and support matrix as needed.

[codecov]

Codecov Report

❌ Patch coverage is 44.44444% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.05%. Comparing base (5e69ede) to head (d2cb325).
⚠️ Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/selection/dynamic_flow_attrs.go	45.71%	16 Missing and 3 partials ⚠️
pkg/internal/appolly/appolly.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2498      +/-   ##
==========================================
- Coverage   69.08%   69.05%   -0.04%     
==========================================
  Files         345      345              
  Lines       46728    46746      +18     
==========================================
- Hits        32284    32281       -3     
- Misses      12414    12418       +4     
- Partials     2030     2047      +17     

Flag	Coverage Δ
integration-test	51.30% <0.00%> (+0.61%)	⬆️
integration-test-arm	27.09% <0.00%> (-0.07%)	⬇️
integration-test-vm-5.15-lts	?
integration-test-vm-6.18-lts	?
k8s-integration-test	35.84% <0.00%> (+0.15%)	⬆️
oats-test	35.42% <0.00%> (-0.05%)	⬇️
unittests	63.30% <48.48%> (+0.02%)	⬆️

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

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[grcevski]

LGTM! Thanks for fixing the copilot comments from the previous PR. I've launched it again here.

[Copilot]

Pull request overview

This PR applies follow-up fixes to the DynamicSelector-based flow/metadata decoration pipeline, focusing on safer event delivery, clearer lifecycle expectations for kube-store PID registration, and tightening which dynamic attributes are applied to flow (network/stats) metrics.

Changes:

• Switch process event publication to deadlock-safe SendCtx() for dynamic selector file-info updates.
• Remove arbitrary dynamic resource attributes from flow metric decoration (retain service name/namespace only).
• Add PID cleanup for DynamicFlowAttrs to avoid leaking kube-store process registrations, plus new/updated tests.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pkg/selection/dynamic_flow_attrs.go	Removes flow-level resource attribute decoration and adds PID tracking/cleanup for kube-store process registrations.
pkg/selection/dynamic_flow_attrs_test.go	Updates assertions for removed resource attrs and adds coverage for PID unregister behavior.
pkg/selection/dynamic_app_ips.go	Clarifies ResolveContainerIPs() side effect (PID registration) and cleanup responsibility.
pkg/internal/appolly/appolly.go	Uses deadlock-safe SendCtx(ctx, ...) when emitting process events from dynamic selector updates.
pkg/instrumenter/opts.go	Updates documentation comment to reflect flow decoration limited to service name/namespace.