Add caveats to filter setting description

src/main/resources/messages/CoderGatewayBundle.properties

@@ -130,5 +130,11 @@ gateway.connector.settings.ssh-log-directory.comment=If set, the Coder CLI will
   output extra SSH information into this directory, which can be helpful for \
   debugging connectivity issues.
 gateway.connector.settings.workspace-filter.title=Workspace filter
-gateway.connector.settings.workspace-filter.comment=The filter to apply when fetching workspaces. Leave blank to fetch \
-  all workspaces.
+gateway.connector.settings.workspace-filter.comment=The filter to apply when \
+  fetching workspaces. Leave blank to fetch all workspaces. Any workspaces \
+  excluded by this filter will be treated as if they do not exist by the \
+  plugin. This includes the "Connect to Coder" view, the dashboard link \
+  handler, and the recent connections view. Please also note that currently \
+  the plugin fetches resources individually for each non-running workspace, \
+  which can be slow with many workspaces, and it adds every agent to the SSH \
+  config, which can result in a large SSH config with many workspaces.