[Feat-Proxy] Slack Alerting - allow using os.environ/ vars for alert to webhook url

[ishaan-jaff]

allow using os.environ/ vars for alert to webhook ur

general_settings: 
 master_key: sk-1234 
 alerting: ["slack"]
 alerting_threshold: 0.0001 # (Seconds) set an artifically low threshold for testing alerting
 alert_to_webhook_url: {
    "llm_too_slow": [
      "os.environ/SLACK_WEBHOOK_URL",
      "os.environ/SLACK_WEBHOOK_URL_2",
    ],
  }

Relevant issues

Type

🆕 New Feature
🐛 Bug Fix
🧹 Refactoring
📖 Documentation
🚄 Infrastructure
✅ Test

Changes

[REQUIRED] Testing - Attach a screenshot of any new tests passing locall

If UI changes, send a screenshot/GIF of working UI fixes

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Name	Status	Preview	Comments	Updated (UTC)
litellm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 17, 2024 1:04am