Add documentation for Usage Metrics (#286)

Signed-off-by: lujunsan <[email protected]>

Author: lujunsan

docs/toolhive/faq.mdx

@@ -78,6 +78,45 @@ Kubernetes cluster to use it with the operator.
 
 :::
 
+## Privacy and data collection
+
+### Does ToolHive collect any data?
+
+ToolHive collects anonymous usage metrics to help improve the product. These
+metrics include only tool call counts and are completely anonymous. No personal
+information, user identifiers, or sensitive data is collected.
+
+The metrics collection:
+
+- Is enabled by default
+- Only tracks the number of tool calls
+- Uses a randomly generated instance ID (not tied to your identity)
+- Is automatically disabled in CI environments
+- Can be easily disabled
+
+### How do I disable usage metrics?
+
+You can opt out of usage metrics collection in two ways:
+
+**Option 1: Persistent configuration (recommended)**
+
+Use the ToolHive CLI to disable metrics permanently:
+
+```bash
+thv config usage-metrics disable
+```
+
+**Option 2: Environment variable**
+
+Set an environment variable to disable metrics for the current session:
+
+```bash
+export TOOLHIVE_USAGE_METRICS_ENABLED=false
+```
+
+Once you opt out, ToolHive stops collecting and sending usage metrics. You need
+to restart any running servers for the change to take effect.
+
 ## Security and permissions
 
 ### Is it safe to run MCP servers?

docs/toolhive/guides-cli/install.mdx

@@ -155,6 +155,15 @@ Go version: go1.24.1
 Platform: darwin/arm64
 ```
 
+:::info[Privacy: Anonymous usage metrics]
+
+ToolHive collects anonymous usage metrics (tool call counts only) to help
+improve the product. No personal information or sensitive data is collected. You
+can disable this at any time using `thv config usage-metrics disable`. For more
+information, see the [FAQ](../faq.mdx#does-toolhive-collect-any-data).
+
+:::
+
 ## Upgrade ToolHive
 
 ToolHive automatically checks for updates and notifies you when a new version is