feat(docs): add gotify example using webhook custom payload

[TheMeier]

Pull Request Checklist

Please check all the applicable boxes.

• Please list all open issue(s) discussed with maintainers related to this change
  • Fixes Feature suggestion: Add Gotify as receiver #2120
• I have added/updated the required documentation
• I have signed-off my commits
• I will follow best practices for contributing to this project

Which user-facing changes does this PR introduce?

NONE

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between d036b5e and dd7ca93.

📒 Files selected for processing (3)

• docs/configuration.md
• docs/notification_examples.md
• examples/webhook/gotify.yml

🚧 Files skipped from review as they are similar to previous changes (3)

• docs/configuration.md
• examples/webhook/gotify.yml
• docs/notification_examples.md

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📝 Walkthrough

Walkthrough

Adds a Gotify webhook configuration example with secret-based authentication, templated payload fields, alert rendering, and links from the Alertmanager documentation.

Changes

Gotify webhook documentation

Layer / File(s)	Summary
Gotify webhook configuration examples/webhook/gotify.yml	Defines a Gotify receiver with X-Gotify-Key authentication, resolved notifications, Markdown formatting, conditional priority, and templated alert messages.
Gotify usage documentation docs/notification_examples.md, docs/configuration.md	Documents the generic webhook setup for Gotify and links to additional payload examples.

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

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	The PR documents a generic webhook workaround but does not add Gotify as a dedicated Alertmanager receiver requested by issue #2120.	Confirm that the generic webhook example satisfies issue #2120, or implement and test a dedicated Gotify receiver.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the added Gotify webhook custom-payload example.
Description check	✅ Passed	The description identifies issue #2120, documents the completed work, marks relevant checklist items, and specifies that no release note is needed.
Out of Scope Changes check	✅ Passed	All changes concern the Gotify webhook integration and its documentation, so no unrelated out-of-scope changes are evident.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@examples/webhook/gotify.yml`:
- Line 38: Update the Gotify priority template in the webhook example to remove
the surrounding quotes, so firing and non-firing statuses render integer values
5 and 0 rather than strings. Apply the same change to the mirrored Gotify
example in docs/notification_examples.md.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 0b9f60ec-8dc5-4172-ae4b-31a2aa3e02c9

📥 Commits

Reviewing files that changed from the base of the PR and between 846bdbf and d036b5e.

📒 Files selected for processing (3)

• docs/configuration.md
• docs/notification_examples.md
• examples/webhook/gotify.yml