Start sssd with -d 4 (or higher). Watch until the ping interval occurs. You should see all of the configured components pinged at the same time.

Now, kill one of them with a SIGTERM (I killed the Data Provider). It will automatically restart.

Watch the output in the console. It will be pinged once with all of the other services, and again at a different time. Kill it again and you will see three pings, etc.

We need to ensure that we remove the original ping request when restarting the service, else in a very long-running situation we could end up wasting a lot of time processing pings.