Currently the Revision GC is allowed to run at full speed. In some cases the load caused by the Revision GC can be very high and potentially overwhelm the MongoDB cluster. The high Revision GC activity tends to be higher than usual when it was skipped for a longer period of time, e.g. because there is a checkpoint that prevents it from collecting garbage.
Consider throttling the Revision GC. The implementation already has some support for throttling. See VersionGCOptions.delayFactor. However, there is currently no configuration option in the DocumentNodeStoreService.