docs(platforms): remove now obsolete metrics deprecation

[Flash0ver]

DESCRIBE YOUR PR

The final two redirects from the previously deprecated metrics, now reborn in Trace-connected Metrics.
They be gone.

Follow-ups to

• feat(apple): Add documentation for metrics #15822
• feat(Unity): Added Metrics #16356

IS YOUR CHANGE URGENT?

Help us prioritize incoming PRs by letting us know when the change needs to go live.

• Urgent deadline (GA date, etc.): ASAP
  • Metrics are in Open Beta, and available in the latest sentry-cocoa and unity SDKs
• Other deadline:
• None: Not urgent, can wait up to 1 week+

SLA

• Teamwork makes the dream work, so please add a reviewer to your PRs.
• Please give the docs team up to 1 week to review your PR unless you've added an urgent due date to it.
  Thanks in advance for your help!

PRE-MERGE CHECKLIST

Make sure you've checked the following before merging your changes:

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

EXTRA RESOURCES

• Sentry Docs contributor guide

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Project	Deployment	Actions	Updated (UTC)
develop-docs	Ready	Preview, Comment	Feb 12, 2026 11:10am
sentry-docs	Ready	Preview, Comment	Feb 12, 2026 11:10am

[bitsandfoxes]