For monitoring SQL Server replication, here are 11 metrics I often add into DPA as custom metrics. Some of these are optional and would only apply if you are using, for example, merge replication. Add each one as a separate custom metric (Options > Custom Metrics) in DPA and make them look similar to this example. Note that not all of them will have thresholds as this one does. I like to add thresholds on the latency metrics and the merge conflicts metric, so that I can also alert on them:
