Update installation documentation for Robusta

[aantn]

No description provided.

[github-actions]

✅ Docker image ready for 7f7156c (built in 2m 39s)

• us-central1-docker.pkg.dev/robusta-development/temporary-builds/robusta-runner:7f7156c

⚠️ 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:7f7156c
docker tag us-central1-docker.pkg.dev/robusta-development/temporary-builds/robusta-runner:7f7156c me-west1-docker.pkg.dev/robusta-development/development/robusta-runner-dev:7f7156c
docker push me-west1-docker.pkg.dev/robusta-development/development/robusta-runner-dev:7f7156c

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:7f7156c

[coderabbitai]

Walkthrough

The PR updates Robusta's installation documentation to enhance clarity around Prometheus enablement and observability stack compatibility. It adds a new section with instructions for enabling the Prometheus stack in generated_values.yaml and revises messaging to reflect broader observability platform support and updated feature descriptions.

Changes

Cohort / File(s)	Summary
Prometheus Configuration Documentation docs/setup-robusta/installation/all-in-one-installation.rst	Added new "Enable Prometheus Stack" section with instructions to modify generated_values.yaml by adding enablePrometheusStack: true before Helm installation steps
Installation Index Messaging Updates docs/setup-robusta/installation/index.rst	Updated two UI copy strings: expanded observability stack compatibility mention (added Prometheus explicitly) and revised setup description for new environments without existing observability

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• #1948: Modifies the same installation file (all-in-one-installation.rst) with Prometheus-related content changes.
• #1874: Updates overlapping documentation areas covering Prometheus installation and compatibility messaging.
• #1883: Related documentation changes addressing observability and Prometheus wording and configuration.

Suggested reviewers

• arikalon1

🚥 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 brief description explaining the motivation for updating the installation documentation and the changes made (e.g., why Prometheus stack enablement was added and UI copy was revised).

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Update installation documentation for Robusta' accurately describes the main change: updating installation docs with new content about Prometheus stack and revised UI copy.
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/update-robusta-docs-fNI7y

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@docs/setup-robusta/installation/index.rst`:
- Line 33: Remove the trailing whitespace at the end of the sentence "For brand
new environments without existing observability. Five minute setup. Great
default alerts." in docs/setup-robusta/installation/index.rst so the line ends
exactly with "alerts." with no extra spaces.