code: def _get_master_proc_by_name(self, name, tags):
          
          master_name = GUnicornCheck._get_master_proc_name(name)
          master_procs = [p for p in psutil.process_iter() if p.cmdline() and p.cmdline()[0] == master_name]
          if len(master_procs) == 0:
              # process not found, it's dead.
              self.service_check(
                  self.SVC_NAME,
                  AgentCheck.CRITICAL,
                  tags=['app:' + name] + tags,
                  message="No gunicorn process with name %s found" % name,
              )
              raise GUnicornCheckError("Found no master process with name: %s" % master_name)
          else:
              self.log.debug("There exist %s master process(es) with the name %s" % (len(master_procs), name))
              return master_procs
docs: Return a psutil process for the master gunicorn process with the given name.