`-la` doesn't enable all event types
If you look at the implementation of read_trace_flags
(https://gitlab.haskell.org/ghc/ghc/-/blob/master/rts/RtsFlags.c#L2335) you will see that -la
doesn't in fact turn on all classes of events.
It seems to be missing nonmoving_gc
and ticky
.
I'd be happy to submit a fix.