docs(alerting.md): add slack alerting to docs

docs/my-website/docs/proxy/alerting.md

@@ -0,0 +1,36 @@
+# Slack Alerting
+
+Get alerts for failed db read/writes, hanging api calls, failed api calls. 
+
+## Quick Start
+
+Set up a slack alert channel to receive alerts from proxy.
+
+### Step 1: Add a Slack Webhook URL to env
+
+Get a slack webhook url from https://api.slack.com/messaging/webhooks
+
+
+### Step 2: Update config.yaml 
+
+Let's save a bad key to our proxy
+
+```yaml
+model_list: 
+    model_name: "azure-model"
+    litellm_params:
+        model: "azure/gpt-35-turbo"
+        api_key: "my-bad-key" # 👈 bad key
+
+general_settings: 
+    alerting: ["slack"]
+
+environment_variables:
+    SLACK_WEBHOOK_URL: "https://hooks.slack.com/services/<>/<>/<>"
+```
+
+### Step 3: Start proxy
+
+```bash
+$ litellm /path/to/config.yaml
+```

docs/my-website/sidebars.js

@@ -113,6 +113,7 @@ const sidebars = {
         "proxy/health",
         "proxy/call_hooks",
         "proxy/caching",
+        "proxy/alerting",
         "proxy/logging", 
         "proxy/streaming_logging",
         "proxy/deploy",