Document DI environment variables across languages

content/en/dynamic_instrumentation/enabling/_index.md

@@ -16,6 +16,21 @@ Select your runtime below to learn how to enable Dynamic Instrumentation for you
 
 {{< partial name="dynamic_instrumentation/dynamic-instrumentation-languages.html" >}}
 
+## Supported environment variables
+
+| Environment Variable | Default | Java | .NET | Python | Ruby | PHP | Node.js | Description
+| -------------------- | ------- | ---- | ---- | ------ | ---- | --- | ------- | -----------
+| `DD_DYNAMIC_INSTRUMENTATION_ENABLED` | `"false"` | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | Enable Dynamic Instrumentation
+| `DD_DYNAMIC_INSTRUMENTATION_REDACTED_IDENTIFIERS` | `""` | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | Add identifiers to redact
+| `DD_DYNAMIC_INSTRUMENTATION_REDACTED_TYPES` | `""` | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | Add types to redact
+| `DD_DYNAMIC_INSTRUMENTATION_REDACTION_EXCLUDED_IDENTIFIERS` | `""` | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | Remove identifiers from redaction
+| `DD_SERVICE` | `""` | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | Service name
+| `DD_ENV` | `""` | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | Environment name
+| `DD_VERSION` | `""` | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | Service version
+| `DD_TAGS` | `""` | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | Tags
+| `DD_GIT_REPOSITORY_URL` | `""` | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | Git repository URL
+| `DD_GIT_COMMIT_SHA` | `""` | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | Git commit SHA
+
 ## Further reading
 
 {{< partial name="whats-next/whats-next.html" >}}