code: func Register() {
  	registerMetrics.Do(func() {
  		prometheus.MustRegister(DockerOperationsLatency)
  		prometheus.MustRegister(DockerOperations)
  		prometheus.MustRegister(DockerOperationsErrors)
  		prometheus.MustRegister(DockerOperationsTimeout)
  		prometheus.MustRegister(DeprecatedDockerOperationsLatency)
  		prometheus.MustRegister(DeprecatedDockerOperations)
  		prometheus.MustRegister(DeprecatedDockerOperationsErrors)
  		prometheus.MustRegister(DeprecatedDockerOperationsTimeout)
  	})
  }
docs: // Register all metrics.