fix: do not fail the CLI when GitLab API return 5xx code

pr_agent/agent/pr_agent.py

@@ -1,6 +1,9 @@
 import shlex
 from functools import partial
 
+import gitlab
+from starlette.status import HTTP_500_INTERNAL_SERVER_ERROR, HTTP_503_SERVICE_UNAVAILABLE
+
 from pr_agent.algo.ai_handlers.base_ai_handler import BaseAiHandler
 from pr_agent.algo.ai_handlers.litellm_ai_handler import LiteLLMAIHandler
 from pr_agent.algo.cli_args import CliArgs
@@ -113,7 +116,19 @@ class PRAgent:
                 if notify:
                     notify()
 
-                await command2class[action](pr_url, ai_handler=self.ai_handler, args=args).run()
+                try:
+                    await command2class[action](pr_url, ai_handler=self.ai_handler, args=args).run()
+                except gitlab.GitlabError as gitlab_error:
+                    # For GitLab 5xx codes see: https://docs.gitlab.com/api/rest/troubleshooting/#status-codes
+                    if gitlab_error.response_code in {HTTP_500_INTERNAL_SERVER_ERROR, HTTP_503_SERVICE_UNAVAILABLE}:
+                        # The problem is likely temporary and not on our side; therefore, do not fail the application.
+                        get_logger().error(
+                            f"Failed to process the command due to a problem on the GitLab API side: {gitlab_error!r}\n"
+                            + "Check https://status.gitlab.com and try again later."
+                        )
+                        return False
+                    raise
+
             else:
                 return False
             return True