feat(Metrics): Updated all docs related to Application Metrics

[sfanahata]

DESCRIBE YOUR PR

• Changed Metrics --> Application Metrics
• Added new functionality
• Updated Arcade and screenshots

Main preview: https://sentry-docs-git-feat-application-metrics-ga.sentry.dev/product/explore/metrics/

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• Urgent deadline (GA date, etc.):
• Other deadline: April 28th
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SLA

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PRE-MERGE CHECKLIST

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• Checked Vercel preview for correctness, including links
• PR was reviewed and approved by any necessary SMEs (subject matter experts)
• PR was reviewed and approved by a member of the Sentry docs team

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Project	Deployment	Actions	Updated (UTC)
develop-docs	Ready	Preview, Comment	Apr 22, 2026 9:11pm
sentry-docs	Ready	Preview, Comment	Apr 22, 2026 9:11pm