Ambari-Metrics

To restore the backed-up Ambari-Metrics data, downgrade the ambari-metrics packages on all hosts and restore the backed-up-ambari-metrics data.

Downgrade ambari-metrics packages on all hosts where they are installed. On every host in your cluster running a Metrics Monitor, run the following commands:
```
yum downgrade ambari-metrics-monitor ambari-metrics-hadoop-sink
```
Execute the following command on all hosts running the Metrics Collector:
```
yum downgrade ambari-metrics-collector
```
Execute the following command on the host running the Grafana component:
```
yum downgrade ambari-metrics-grafana
```
Restore backed-up ambari-metrics data on the host where the ambari-metrics-collector is installed
```
rm -rf /var/lib/ambari-metrics-collector
tar xf ams-backup.tar.gz  -C /
```
Start Ambari-Metics in Ambari UI.