Update alert_graph.md

[KevinLalor]

What does this PR do? What is the motivation?

Changing APM to APM Metrics to make it more clear that Trace Analytics and Watchdog APM type monitors are not supported.

Merge instructions

Merge readiness:

• [Yes] Ready for merge

Merge queue is enabled in this repo. To have it automatically merged after it receives the required reviews, create the PR (from a branch that follows the <yourname>/description naming convention) and then add the following PR comment:

/merge

[KevinLalor]

/merge

[dd-devflow]

Devflow running: /merge

View all feedbacks in Devflow UI.

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2024-12-12 16:03:33 UTC ℹ️ MergeQueue: waiting for PR to be ready

This merge request is not mergeable yet, because of pending checks/missing approvals. It will be added to the queue as soon as checks pass and/or get approvals.
Note: if you pushed new commits since the last approval, you may need additional approval.
You can remove it from the waiting list with /remove command.

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2024-12-12 20:03:36 UTC ⚠️ MergeQueue: This merge request was unqueued

This merge request was unqueued

[michaelcretzman]

@KevinLalor Hey, our repo contribution guidelines require that you name your branch with the convention slack_username/branch_name.

If you don't include the forward slash (/), the Gitlab pipeline won't run and you won't get a branch preview. Getting a branch preview makes it easier for us to check for any issues with your PR, such as broken links.

To find your Slack username, see https://www.highviewapps.com/kb/how-do-i-find-my-slack-username/.
To rename your branch, go to https://github.com/DataDog/documentation/branches, find this branch, and then select ... and Rename branch.

[michaelcretzman]

needs a branch name that matches our requirements. see earlier comment