Junos BTLB binary without the BTLB_FLAG env set.

Nov 19 07:31:26  SRX-01 /kernel: exec_elf32_imgact: Running BTLB binary without the BTLB_FLAG env set
Nov 19 07:31:28  SRX-01 mgd[4433]: UI_CHILD_EXITED: Child exited: PID 4466, status 1, command '/usr/sbin/wmic'
Nov 19 07:31:29  SRX-01 mgd[4433]: UI_CHILD_EXITED: Child exited: PID 4467, status 1, command '/proc/1931/file'
Nov 19 07:31:29  SRX-01 mgd[4433]: UI_CHILD_EXITED: Child exited: PID 4471, status 1, command '/usr/sbin/webapid'

I have been observing the above log messages on SRX-550 every hour, and at first I was quite concerned, after some research, it turns out to be nothing to worry about.
The message is produced every time you do a show version detail
What happens is that a new forwarding process is started up in parallel to the one that is already running (and doing the forwarding). The new process is started without a flag being set, and is only running for long enough to get the binary version from it and then shuts down.
The reason it happened every hour for me is because; we have Rancid collecting configuration backup from the device every hour and part of the Rancid script runs the show version detail