Document the RABBITMQ_FEATURE_FLAGS_FILE env variable

for completeness sake.

Author: michaelklishin

docs/relocate.md

@@ -176,12 +176,22 @@ file and directories have sufficient permissions
     <td>RABBITMQ_ENABLED_PLUGINS_FILE</td>
     <td>
       This file records explicitly enabled plugins. When a plugin
-      is enabled or disabled, this file will be recreated. It is
+      is enabled or disabled, this file will be updated. It is
       important that effective RabbitMQ user has sufficient permissions
       to read, write and create this file at any time.
     </td>
   </tr>
 
+  <tr>
+    <td>RABBITMQ_FEATURE_FLAGS_FILE</td>
+    <td>
+      This file contains a list of all enabled <a href="./feature-flags">feature flags</a>. When a feature flag
+      is enabled, this file will be updated. It is
+      crucially important that effective RabbitMQ user has sufficient permissions
+      to read, write and create this file at any time.
+    </td>
+  </tr>
+
   <tr>
     <td>RABBITMQ_PID_FILE</td>
     <td>
@@ -272,6 +282,13 @@ default this is `/opt/homebrew` on Apple Silicon-based Macs.
     </td>
   </tr>
 
+  <tr>
+    <td>RABBITMQ_FEATURE_FLAGS_FILE</td>
+    <td>
+      `$RABBITMQ_MNESIA_BASE/$RABBITMQ_NODENAME-feature_flags`
+    </td>
+  </tr>
+
   <tr>
     <td>RABBITMQ_PID_FILE</td>
     <td>
@@ -345,6 +362,13 @@ default this is `/opt/homebrew` on Apple Silicon-based Macs.
     </td>
   </tr>
 
+  <tr>
+    <td>RABBITMQ_FEATURE_FLAGS_FILE</td>
+    <td>
+      `%RABBITMQ_MNESIA_BASE%\%RABBITMQ_NODENAME%-feature_flags`
+    </td>
+  </tr>
+
   <tr>
     <td>RABBITMQ_PID_FILE</td>
     <td>(Not currently supported)</td>
@@ -418,6 +442,13 @@ customize it, such as the [Homebrew formula](./install-homebrew).
     </td>
   </tr>
 
+  <tr>
+    <td>RABBITMQ_FEATURE_FLAGS_FILE</td>
+    <td>
+      `$RABBITMQ_MNESIA_BASE/$RABBITMQ_NODENAME-feature_flags`
+    </td>
+  </tr>
+
   <tr>
     <td>RABBITMQ_PID_FILE</td>
     <td>

versioned_docs/version-3.13/relocate.md

@@ -182,6 +182,16 @@ file and directories have sufficient permissions
       </td>
     </tr>
 
+    <tr>
+      <td>RABBITMQ_FEATURE_FLAGS_FILE</td>
+      <td>
+      This file contains a list of all enabled <a href="./feature-flags">feature flags</a>. When a feature flag
+      is enabled, this file will be updated. It is
+      crucially important that effective RabbitMQ user has sufficient permissions
+      to read, write and create this file at any time.
+      </td>
+    </tr>
+
     <tr>
       <td>RABBITMQ_PID_FILE</td>
       <td>
@@ -272,6 +282,13 @@ default this is `/opt/homebrew` on Apple Silicon-based Macs.
       </td>
     </tr>
 
+    <tr>
+      <td>RABBITMQ_FEATURE_FLAGS_FILE</td>
+      <td>
+      `$RABBITMQ_MNESIA_BASE/$RABBITMQ_NODENAME-feature_flags`
+      </td>
+    </tr>
+
     <tr>
       <td>RABBITMQ_PID_FILE</td>
       <td>
@@ -345,6 +362,13 @@ default this is `/opt/homebrew` on Apple Silicon-based Macs.
       </td>
     </tr>
 
+    <tr>
+      <td>RABBITMQ_FEATURE_FLAGS_FILE</td>
+      <td>
+      `%RABBITMQ_MNESIA_BASE%\%RABBITMQ_NODENAME%-feature_flags`
+      </td>
+    </tr>
+
     <tr>
       <td>RABBITMQ_PID_FILE</td>
       <td>(Not currently supported)</td>
@@ -418,6 +442,13 @@ customize it, such as the [Homebrew formula](./install-homebrew).
       </td>
     </tr>
 
+    <tr>
+      <td>RABBITMQ_FEATURE_FLAGS_FILE</td>
+      <td>
+      `$RABBITMQ_MNESIA_BASE/$RABBITMQ_NODENAME-feature_flags`
+      </td>
+    </tr>
+
     <tr>
       <td>RABBITMQ_PID_FILE</td>
       <td>

versioned_docs/version-4.0/relocate.md

@@ -182,6 +182,16 @@ file and directories have sufficient permissions
       </td>
     </tr>
 
+    <tr>
+      <td>RABBITMQ_FEATURE_FLAGS_FILE</td>
+      <td>
+      This file contains a list of all enabled <a href="./feature-flags">feature flags</a>. When a feature flag
+      is enabled, this file will be updated. It is
+      crucially important that effective RabbitMQ user has sufficient permissions
+      to read, write and create this file at any time.
+      </td>
+    </tr>
+
     <tr>
       <td>RABBITMQ_PID_FILE</td>
       <td>
@@ -272,6 +282,13 @@ default this is `/opt/homebrew` on Apple Silicon-based Macs.
       </td>
     </tr>
 
+    <tr>
+      <td>RABBITMQ_FEATURE_FLAGS_FILE</td>
+      <td>
+      `$RABBITMQ_MNESIA_BASE/$RABBITMQ_NODENAME-feature_flags`
+      </td>
+    </tr>
+
     <tr>
       <td>RABBITMQ_PID_FILE</td>
       <td>
@@ -345,6 +362,13 @@ default this is `/opt/homebrew` on Apple Silicon-based Macs.
       </td>
     </tr>
 
+    <tr>
+      <td>RABBITMQ_FEATURE_FLAGS_FILE</td>
+      <td>
+      `%RABBITMQ_MNESIA_BASE%\%RABBITMQ_NODENAME%-feature_flags`
+      </td>
+    </tr>
+
     <tr>
       <td>RABBITMQ_PID_FILE</td>
       <td>(Not currently supported)</td>
@@ -418,6 +442,13 @@ customize it, such as the [Homebrew formula](./install-homebrew).
       </td>
     </tr>
 
+    <tr>
+      <td>RABBITMQ_FEATURE_FLAGS_FILE</td>
+      <td>
+      `$RABBITMQ_MNESIA_BASE/$RABBITMQ_NODENAME-feature_flags`
+      </td>
+    </tr>
+
     <tr>
       <td>RABBITMQ_PID_FILE</td>
       <td>

versioned_docs/version-4.1/relocate.md

@@ -182,6 +182,16 @@ file and directories have sufficient permissions
       </td>
     </tr>
 
+    <tr>
+      <td>RABBITMQ_FEATURE_FLAGS_FILE</td>
+      <td>
+      This file contains a list of all enabled <a href="./feature-flags">feature flags</a>. When a feature flag
+      is enabled, this file will be updated. It is
+      crucially important that effective RabbitMQ user has sufficient permissions
+      to read, write and create this file at any time.
+      </td>
+    </tr>
+
     <tr>
       <td>RABBITMQ_PID_FILE</td>
       <td>
@@ -272,6 +282,13 @@ default this is `/opt/homebrew` on Apple Silicon-based Macs.
       </td>
     </tr>
 
+    <tr>
+      <td>RABBITMQ_FEATURE_FLAGS_FILE</td>
+      <td>
+      `$RABBITMQ_MNESIA_BASE/$RABBITMQ_NODENAME-feature_flags`
+      </td>
+    </tr>
+
     <tr>
       <td>RABBITMQ_PID_FILE</td>
       <td>
@@ -345,6 +362,13 @@ default this is `/opt/homebrew` on Apple Silicon-based Macs.
       </td>
     </tr>
 
+    <tr>
+      <td>RABBITMQ_FEATURE_FLAGS_FILE</td>
+      <td>
+      `%RABBITMQ_MNESIA_BASE%\%RABBITMQ_NODENAME%-feature_flags`
+      </td>
+    </tr>
+
     <tr>
       <td>RABBITMQ_PID_FILE</td>
       <td>(Not currently supported)</td>
@@ -418,6 +442,13 @@ customize it, such as the [Homebrew formula](./install-homebrew).
       </td>
     </tr>
 
+    <tr>
+      <td>RABBITMQ_FEATURE_FLAGS_FILE</td>
+      <td>
+      `$RABBITMQ_MNESIA_BASE/$RABBITMQ_NODENAME-feature_flags`
+      </td>
+    </tr>
+
     <tr>
       <td>RABBITMQ_PID_FILE</td>
       <td>