QPS:       qps,
					CacheSize: tc.namespaceCacheSize,
				}
				config.Limits = append(config.Limits, namespaceLimit)
			}
			if tc.userBurst > 0 {
				userLimit := eventratelimitapi.Limit{
					Type:      eventratelimitapi.UserLimitType,
					Burst:     tc.userBurst,
					QPS:       qps,
					CacheSize: tc.userCacheSize,
				}
				config.Limits = append(config.Limits, userLimit)
			}

	}
	primaryGid, err := strconv.Atoi(u.Gid)
	if err != nil {
		return nil, fmt.Errorf("user: list groups for %s: invalid gid %q", u.Username, u.Gid)
	}

	userCommas := []byte("," + u.Username + ",")  // ,john,
	userFirst := userCommas[1:]                   // john,
	userLast := userCommas[:len(userCommas)-1]    // ,john
	userOnly := userCommas[1 : len(userCommas)-1] // john

	// Add primary Gid first.
	groups := []string{u.Gid}