feat (Metric Alerts): Updated performance metrics to outline that they now create Issues.

[sfanahata]

DESCRIBE YOUR PR

Updated performance metrics to outline that they now create Issues.

• Noticed Crons is also missing, so added details about that.
• Updated anything linking to those anchors
• Updated naming convention to be "Performance Metrics"

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• Checked Vercel preview for correctness, including links
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Project	Deployment	Actions	Updated (UTC)
sentry-docs	Ready	Preview, Comment	Feb 19, 2026 11:25pm

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Project	Deployment	Actions	Updated (UTC)
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