While looking at changes in signatures, I noticed a crash report that rust-minidump minidump-stackwalk ran out of memory on when processing. It looks like rust-minidump minidump-stackwalk occasionally spikes in memory use and gets killed off. That's different than what breakpad stackwalker was doing. (This is pretty hand-wavey since I'm trying to observe what's going on using Grafana.)
I wrote up an issue for it: https://github.com/luser/rust-minidump/issues/355
When it happens, the process dies and returns a SIGABRT (which shows up as a -6 exit code in Grafana). There aren't many on stage--maybe 1 or 2 every 6 hours.
I think that's fine for now and we can fix it as we go along. Aria has some ideas on reducing memory spikes already.
Stage and prod have different loads, but even so I think this doesn't block switching prod to use rust-minidump minidump-stackwalk. If it turns out to be a problem, we'll see it in the memory used graph and can switch back.