In order to visualize the metrics listed above in a graphical manner, Sync Service can be configured to report all its metrics to Graphite. See the sync.metrics.reporter.graphite.* properties in Configure the Sync Service.
Here you can see a glimpse of how the timePerCommit metric looks like in Graphite:
If one or more Sync Service instances form a cluster, the same metric is reported in the graph as an averaged value.