executor_universal_linux log a link to the docs on cgroup error

drivers/shared/executor/executor_universal_linux.go

@@ -77,10 +77,12 @@ func (e *UniversalExecutor) configureResourceContainer(pid int) error {
 
 	err := configureBasicCgroups(cfg)
 	if err != nil {
-		// Debug this error to help diagnose cases where nomad is run with too few
+		// Log this error to help diagnose cases where nomad is run with too few
 		// permissions, but don't return an error. There is no separate check for
 		// cgroup creation permissions, so this may be the happy path.
-		e.logger.Debug("failed to create cgroup", "error", err)
+		e.logger.Warn("failed to create cgroup",
+			"docs", "https://www.nomadproject.io/docs/drivers/raw_exec.html#no_cgroups",
+			"error", err)
 		return nil
 	}
 	e.resConCtx.groups = cfg.Cgroups