Update: I’ve noticed that when rebooting, it appears that Frigate may start before the network share is mounted, in which case it begins to record at the local path and the network share never mounts. Thus after a few days the local volume will be filled by stored footage.
I am solving this for now by setting Frigate to not run at boot, then I manually start it after HAOS is fully booted and the network storage is connected. This is working fine but does add an extra step. I wonder if there is some way I could delay the start of Frigate somehow.
Edit: Solved by creating a HA automation which starts Frigate automatically after a short timeout. I used this thread to get started Delay auto boot for add-ons - #2 by nikipore but the syntax didn’t quite work so I used the HA Visual Editor instead which made it super easy to create a working automation.