Fix new playbook modules not discovered during hot reload

[harinik05]

Summary

• Add importlib.invalidate_caches() in ConfigLoader.__import_playbooks_package() before pkgutil.walk_packages() so that newly added .py files in playbook repos are discoverable during hot reload

Fixes #2041

Problem

When new .py files are added to a git-based custom playbook repo and a config reload is triggered, pkgutil.walk_packages() does not discover them because Python's FileFinder caches directory listings from the initial import. Changes to existing files work fine via importlib.reload(), but new modules remain invisible until a full pod restart.

Fix

A single call to importlib.invalidate_caches() before the package walk clears the stale FileFinder directory cache, allowing newly installed modules to be found.

Test plan

• Deploy runner with a git-based custom playbook repo
• Add a new .py action file to the repo and push
• Trigger a config reload (e.g., touch the playbooks config secret)
• Verify the new action is registered without a pod restart
• Verify existing action modifications still reload correctly

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 5cee40ac-cc2e-4b63-8e23-89dd7c365373

📥 Commits

Reviewing files that changed from the base of the PR and between 79c5495 and dac6300.

📒 Files selected for processing (1)

• src/robusta/runner/config_loader.py

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Walkthrough

A single call to importlib.invalidate_caches() is added at the start of the __import_playbooks_package method to ensure Python's file finder cache is cleared before discovering playbook modules. This enables pkgutil.walk_packages() to detect newly added .py files during hot reload.

Changes

Cohort / File(s)	Summary
Cache Invalidation for Module Discovery src/robusta/runner/config_loader.py	Added importlib.invalidate_caches() call at the beginning of __import_playbooks_package to ensure newly added .py files in playbook repositories are discovered during config reload without requiring pod restart.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 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 (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: fixing discovery of new playbook modules during hot reload via importlib.invalidate_caches().
Description check	✅ Passed	The description is directly related to the changeset, explaining the problem, fix, and providing a test plan for validating the new playbook module discovery during hot reload.
Linked Issues check	✅ Passed	The code change directly addresses issue #2041 by adding importlib.invalidate_caches() before pkgutil.walk_packages() to clear FileFinder cache, enabling discovery of newly added .py files during config hot reload.
Out of Scope Changes check	✅ Passed	The change is narrowly scoped to the stated objective: only adding importlib.invalidate_caches() call in __import_playbooks_package() without modifying other functionality or introducing unrelated changes.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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