observeSync ({ name, namespace, backend, status }) {
    this._syncCallsCount.inc({
      name,
      namespace,
      backend,
      status
    })
    this._syncCalls.inc({
      name,
      namespace,
      backend,
      status
    })
    if (status === 'success') {
      this._lastSyncCallState.set({
        name,
        namespace,
        backend
      }, 1)
      this._lastState.set({
        name,
        namespace,
        backend
      }, 1)
    } else {
      this._lastSyncCallState.set({
        name,
        namespace,
        backend
      }, -1)
      this._lastState.set({
        name,
        namespace,
        backend
      }, -1)
    }
  }
Observe the result a sync process
@param {String} name - the name of the externalSecret
@param {String} namespace - the namespace of the externalSecret
@param {String} backend - the backend used to fetch the externalSecret
@param {String} status - the result of the sync process: error|success