docs: fix Alertmanager port in amtool config routes example

[s3onghyun]

The "View routing tree of remote Alertmanager" example uses --alertmanager.url=http://localhost:9090, but 9090 is Prometheus's port — Alertmanager's default is 9093 (cmd/alertmanager/main.go, cli/root.go). Every other URL in the README uses 9093, so this line was the lone outlier.

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📥 Commits

Reviewing files that changed from the base of the PR and between f29d44c and d1cfb38.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The amtool config routes example command in README.md had its Alertmanager URL port corrected from 9090 to 9093, which is the default Alertmanager port.

Changes

README Port Fix

Layer / File(s)	Summary
Correct amtool example port README.md	The --alertmanager.url flag in the amtool config routes example is updated from http://localhost:9090 to http://localhost:9093.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~1 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The PR description clearly explains the issue, the fix, and provides context. However, it does not follow the repository's template structure and missing checklist items and release-notes section.	Follow the repository's description template by including the Pull Request Checklist and release-notes sections to indicate which category of change this is.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: fixing an incorrect Alertmanager port in a documentation example for amtool.
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.

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