Add optional label-based rate limiting to trigger_workflow action

[arikalon1]

What

Adds optional rate limiting to the trigger_workflow action, keyed by a user-defined combination of alert labels, plus a playbook-reference docs entry for the action.

New parameters

• rate_limit_labels (optional, default unset — no rate limiting): a list of alert labels, e.g. ["alertname", "pod"]. Alerts matching on all of these labels (AND condition) share one rate limit bucket: after the workflow is triggered once, further matching alerts are logged and skipped until the period passes.
• rate_limit_seconds (optional, default 900): the rate limit period.

Example:

customPlaybooks:
- triggers:
  - on_prometheus_alert: {}
  actions:
  - trigger_workflow:
      workflow_id: "b7f9d2e4-1234-4c56-9abc-0123456789ab"
      api_key: "{{ env.ROBUSTA_PLATFORM_API_KEY }}"
      rate_limit_labels: ["alertname", "pod"]
      rate_limit_seconds: 3600

Implementation notes

• Reuses the existing in-memory RateLimiter.mark_and_test (same mechanism as argo_app_sync and the built-in trigger rate limits), so limits are per runner process and reset on restart — consistent with all existing rate limiting.
• The sorted workflow ids are part of the bucket key, so separate trigger_workflow configurations never rate limit each other.
• A label missing from an alert is treated as an empty value, so alerts that both lack the label still match each other on it.
• Rate-limited firings write an info log naming the alert, label values, and skipped workflow ids.

Docs

• Added a .. robusta-action:: entry for trigger_workflow to docs/playbook-reference/actions/miscellaneous.rst (the action was previously undocumented). The new params render in the Parameters tab via their :var docstrings.

Tests

Added to tests/test_workflow_trigger.py (10/10 passing):

• repeat alert with the same label combination is skipped (single HTTP request)
• a differing value on one of the labels is not rate limited
• the bucket reopens after rate_limit_seconds passes
• no rate limiting by default

---

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Patch Helm values in one line:

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  --reuse-values \
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---

Walkthrough

The trigger_workflow action now supports optional rate limiting by alert label combinations. Matching alerts are skipped during the configured period. Documentation and tests cover the new parameters and behavior.

Changes

Workflow trigger rate limiting

Layer / File(s)	Summary
Rate-limit parameters and documentation playbooks/robusta_playbooks/workflow_trigger.py, docs/playbook-reference/actions/miscellaneous.rst	TriggerWorkflowParams adds rate_limit_labels and rate_limit_seconds. Module, class, and action documentation describe the configuration and default behavior.
Rate-limit enforcement and validation playbooks/robusta_playbooks/workflow_trigger.py, tests/test_workflow_trigger.py	The action builds limiter keys from workflow IDs and selected alert labels, checks RateLimiter, and skips limited alerts. Tests cover repeated alerts, differing labels, expiration, and disabled rate limiting.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: 🟡 Moderate · up to a8279

When label-based rate limiting is enabled, a failed workflow webhook attempt can suppress matching alerts for the full rate-limit period, delaying workflow execution and recovery; merge should wait for a fix or explicit owner acceptance.

Sequence Diagram(s)

sequenceDiagram
  participant PrometheusAlert
  participant trigger_workflow
  participant RateLimiter
  participant WorkflowWebhook
  PrometheusAlert->>trigger_workflow: alert and workflow parameters
  trigger_workflow->>RateLimiter: mark_and_test limiter key and duration
  RateLimiter-->>trigger_workflow: allow or rate-limited result
  trigger_workflow->>WorkflowWebhook: trigger workflow when allowed

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🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 2 files. (1 skipped: …	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 clearly and concisely describes the main change: optional label-based rate limiting for the trigger_workflow action.
Description check	✅ Passed	The description directly explains the new rate-limiting parameters, implementation behavior, documentation updates, and tests.
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.

Full details: Docstring Coverage

Explanation

Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 2 files. (1 skipped: 1 unsupported.)

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• Commit unit tests in branch claude/trigger-workflow-rate-limit-nll3ht

---

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[coderabbitai]

Actionable comments posted: 2

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Inline comments:
In `@playbooks/robusta_playbooks/workflow_trigger.py`:
- Around line 106-108: Update the limiter_id construction in the workflow
trigger path to use an unambiguous structured encoding for workflow_ids and
sorted label/value pairs, such as JSON, instead of concatenating raw values with
commas and equals signs. Preserve deterministic ordering so equivalent inputs
produce the same bucket while distinct label combinations remain distinct.
- Around line 108-109: Preserve the atomic RateLimiter.mark_and_test reservation
in the workflow trigger flow, but release the reservation identified by
"trigger_workflow" and limiter_id whenever requests.post raises or returns a
non-2xx response. Ensure successful 2xx webhook requests retain the reservation,
and use the existing rate-limiter removal or rollback operation rather than
changing unrelated behavior.

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---

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