Add runbooks for API response times alarms

[krysal]

Fixes

Related to #2501 by @sarayourfriend

Description

Adds the run books for the general API response time alarms.

Testing Instructions

Look for the preview in the comments and check that the instructions make sense.

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[github-actions]

Full-stack documentation: https://docs.openverse.org/_preview/3001

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New files ➕:

• https://docs.openverse.org/_preview/3001/meta/monitoring/runbooks/api_avg_response_time_above_threshold.html
• https://docs.openverse.org/_preview/3001/meta/monitoring/runbooks/api_avg_response_time_anomaly.html
• https://docs.openverse.org/_preview/3001/meta/monitoring/runbooks/api_p99_response_time_above_threshold.html
• https://docs.openverse.org/_preview/3001/meta/monitoring/runbooks/api_p99_response_time_anomaly.html

Changed files 🔄:

• https://docs.openverse.org/_preview/3001/meta/monitoring/runbooks/index.html

[dhruvkb]

Looks like both of these runbooks are largely identical in content (as they should be, they're both for response times and likely to co-occur frequently). Can they both be combined into a single runbook instead?

That's an infra change, which might delay things, so I'm approving this to unblock. LGTM!

[openverse-bot]

Based on the high urgency of this PR, the following reviewers are being gently reminded to review this PR:

@obulat
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[obulat]

The links should be updated, and probably the heading.

[krysal]

@obulat I added the runbooks for the anomaly response alarms (WordPress/openverse-infrastructure#622), I'll await your review on this.