Refactor: Set default logging verbosity to WARNING

Changes the default `absl.logging` verbosity level from INFO to WARNING.
This reduces the amount of log output during normal operation, as INFO-level
messages detailing each API call page fetch will no longer be displayed
by default. WARNING and ERROR level logs will still be shown.

Users needing to debug API calls can temporarily change the verbosity
level back to INFO in the script.

Author: google-labs-jules[bot]

scripts/gha/get_pr_review_comments_standalone.py

@@ -43,7 +43,7 @@
 BASE_URL = 'https://api.github.com' # Base URL for GitHub API
 GITHUB_API_URL = '' # Dynamically constructed API URL for the specific repository
 
-logging.set_verbosity(logging.INFO)
+logging.set_verbosity(logging.WARNING)
 
 
 def set_repo_url_standalone(owner_name, repo_name):
@@ -105,7 +105,7 @@ def get_pull_request_review_comments(token, pull_number, since=None):
 
     except requests.exceptions.RequestException as e:
       logging.error(f"Error fetching review comments (page {page}, params: {current_page_params}) for PR {pull_number}: {e}")
-      break
+      return None # Indicate error
   return results
 
 
@@ -136,7 +136,7 @@ def list_pull_requests(token, state, head, base):
         keep_going = (len(current_page_results) == per_page)
     except requests.exceptions.RequestException as e:
       logging.error(f"Error listing pull requests (page {params.get('page', 'N/A')}, params: {params}) for {OWNER}/{REPO}: {e}")
-      break
+      return None # Indicate error
   return results
 
 
@@ -354,9 +354,12 @@ def parse_repo_url(url_string):
         since=args.since
     )
 
-    if not comments:
-        sys.stderr.write(f"No review comments found for PR #{pull_request_number} (or matching filters), or an error occurred.\n")
-        return
+    if comments is None: # Explicit check for None, indicating an API/network error
+        sys.stderr.write(f"Error: Failed to fetch review comments due to an API or network issue.{error_suffix}\nPlease check logs for details.\n")
+        sys.exit(1)
+    elif not comments: # Empty list, meaning no comments found or matching filters
+        sys.stderr.write(f"No review comments found for PR #{pull_request_number} (or matching filters).\n")
+        return # Graceful exit with 0
 
     latest_activity_timestamp_obj = None
     processed_comments_count = 0