docs: document JSON log format toggle

[moshemorad]

Summary

Adds documentation for the JSON log format toggle shipped in ROB-459.

• New page docs/setup-robusta/json-logging.rst describing global.enableJsonLogsFormat, which switches robusta-runner (and KRR scan jobs, and HolmesGPT when deployed via the chart) to structured JSON logs (one object per line, level → severity).
• Documents the standalone krr-enforcer chart's own enableJsonLogsFormat value.
• Registered the page in the setup-robusta toctree.

Default behavior is unchanged (colored text) unless the toggle is set.

Part of ROB-459 (sub-task ROB-694). The Holmes-side docs (ENABLE_JSON_LOGS_FORMAT env-var reference) already shipped with the Holmes JSON-logging PR.

🤖 Generated with Claude Code

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Generated by Claude Code

[github-actions]

✅ Docker image ready for 7f43f1f (built in 2m 16s)

• us-central1-docker.pkg.dev/robusta-development/temporary-builds/robusta-runner:7f43f1f

⚠️ Warning: does not support ARM (ARM images are built on release only - not on every PR)

Use this tag to pull the image for testing.

📋 Copy commands

⚠️ Temporary images are deleted after 30 days. Copy to a permanent registry before using them:

gcloud auth configure-docker us-central1-docker.pkg.dev
docker pull us-central1-docker.pkg.dev/robusta-development/temporary-builds/robusta-runner:7f43f1f
docker tag us-central1-docker.pkg.dev/robusta-development/temporary-builds/robusta-runner:7f43f1f me-west1-docker.pkg.dev/robusta-development/development/robusta-runner-dev:7f43f1f
docker push me-west1-docker.pkg.dev/robusta-development/development/robusta-runner-dev:7f43f1f

Patch Helm values in one line:

helm upgrade --install robusta robusta/robusta \
  --reuse-values \
  --set runner.image=me-west1-docker.pkg.dev/robusta-development/development/robusta-runner-dev:7f43f1f

[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: 80d4bff2-d8c9-4a33-9976-9f486b0c343e

📥 Commits

Reviewing files that changed from the base of the PR and between 9b849ad and bcbe490.

📒 Files selected for processing (1)

• docs/setup-robusta/json-logging.rst

💤 Files with no reviewable changes (1)

• docs/setup-robusta/json-logging.rst

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Walkthrough

Adds a Robusta setup page documenting structured JSON logging, its Helm toggle, component coverage, default behavior, and log format, and links the page from the setup documentation navigation.

Changes

JSON logging documentation

Layer / File(s)	Summary
Document JSON logging setup docs/setup-robusta/json-logging.rst, docs/setup-robusta/index.rst	Documents enabling JSON logs with global.enableJsonLogsFormat, supported components, disabled-by-default behavior, and one-object-per-line output, then adds the page to the setup navigation.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Possibly related PRs

• robusta-dev/robusta#2120: Introduces the JSON logging Helm and environment-variable setting documented here.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main documentation change about the JSON log toggle.
Description check	✅ Passed	The description matches the change set and explains the new docs page and toctree update.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/rob-694-docs

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