nfsdcltrack(8) on Linux
The text 863c52e54326, as Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch) shipped it.
NFSv4 Client Tracking Callout Program
Flags it lists
-
--debug -
--foreground -
--storagedir -
-d -
-f -
-s