docs: Add missing instrumentation context

src/docs/sdk/event-payloads/contexts.mdx

@@ -810,3 +810,34 @@ This is mostly set on transactions in a web server environment where one transac
   }
 }
 ```
+
+## Missing Instrumentation Context
+
+Context contains information about missing or failed OTEL instrumentation.
+
+The required field is `package` which should contain the package or framework where a missing instrumentation was detected.
+
+`package`
+
+: **Required.** The package or framework where a missing instrumentation was detected.
+
+- Example: `express`
+
+`javascript.is_cjs`
+
+: _Optional_. Boolean that indicates if the context was added from a commonjs module.
+
+- Example: `true`
+
+### Example Response Context
+
+```json
+{
+  "contexts": {
+    "missing_instrumentation": {
+      "package": "express",
+      "javascript.is_cjs": true,
+    }
+  }
+}
+```