[ROB-3081] Add GCP alerts webhook documentation

[Avi-Robusta]

No description provided.

[github-actions]

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[coderabbitai]

Walkthrough

Adds a new GCP Cloud Monitoring webhook integration doc and updates documentation navigation to include the new page.

Changes

Cohort / File(s)	Summary
GCP Cloud Monitoring Integration Documentation docs/configuration/alertmanager-integration/gcp-monitoring.rst	New guide describing prerequisites, obtaining Robusta account_id/API key, creating a GCP webhook notification channel (Basic Auth), configuring the webhook endpoint, applying the webhook in alerting policies (requires cluster_name label), and validation steps.
Documentation Navigation Updates docs/configuration/index.rst, docs/index.rst	Adds a GCP Cloud Monitoring card to the configuration grid and adds the GCP entry to the Send Alerts toctree for navigation.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• Update docs #1874: Edits docs/configuration and docs/index entries related to GCP monitoring documentation.
• [ROB-2217] Docs for Additional alert forwarding #1930: Adds Alertmanager webhook integration docs and updates configuration index entries.

Suggested reviewers

• arikalon1
• RoiGlinik

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	No pull request description was provided by the author, making it impossible to assess whether it relates to the changeset.	Add a description explaining the purpose of the GCP Cloud Monitoring webhook documentation, even if brief.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: adding documentation for GCP Cloud Monitoring webhook alerts integration.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch claude/add-gcp-webhook-docs-1K2de

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@docs/configuration/alertmanager-integration/gcp-monitoring.rst`:
- Around line 45-56: Update "Step 3: Use the Webhook in Alerting Policies" to
instruct users to add the cluster_name as an Alert Policy User Label (structured
key/value) instead of placing it in the policy's Documentation section;
specifically, replace the bullet that tells them to add the label in
Documentation with instructions to add a User Label key: cluster_name and value:
your cluster name (or external), and mention that this label will be delivered
in the webhook JSON under incident.policy_user_labels so Robusta can read it.

🧹 Nitpick comments (1)

docs/index.rst (1)

43-43: Consider alphabetical ordering of entries.

The new "GCP Cloud Monitoring" entry is placed after "Google Managed Prometheus" (line 42), but alphabetically "GCP" should come before "Google" (G-C-P vs G-o-o-g-l-e).

📝 Suggested alphabetical ordering

   Embedded Prometheus Stack <configuration/alertmanager-integration/embedded-prometheus>
-  Google Managed Prometheus <configuration/alertmanager-integration/google-managed-prometheus>
   GCP Cloud Monitoring <configuration/alertmanager-integration/gcp-monitoring>
+  Google Managed Prometheus <configuration/alertmanager-integration/google-managed-prometheus>
   Grafana - Self-Hosted <configuration/alertmanager-integration/grafana-self-hosted>