docs: def init_sentry(self):
          """Install Sentry handler if config defines 'SENTRY_DSN'."""
          dsn = self.config.get("SENTRY_DSN")
          if not dsn:
              return
  
          try:
              import sentry_sdk
          except ImportError:
              logger.error(
                  'SENTRY_DSN is defined in config but package "sentry-sdk"'
                  " is not installed."
              )
              return
  
          from sentry_sdk.integrations.flask import FlaskIntegration
  
          sentry_sdk.init(dsn=dsn, integrations=[FlaskIntegration()])