Any breaking changes which can introduce crashes to look into?
Stormpot (MD pool), but this should work fine. Commons io might be worth because previous version is from 2005 and maybe things have changed since then (e.g. try deleting cache). And acra has breaking changes too, but I think this will work.
java.lang.VerifyError: Rejecting class stormpot.BSlot that attempts to sub-type erroneous class stormpot.BSlotColdFields (declaration of 'stormpot.BSlot' appears in /data/app/~~VG4bbRer2cJXFsH210gInA==/org.mian.gitnex-tbLqaHSg1ciymLOtupSwrA==/base.apk!classes14.dex)
I downgraded stormpot back because I didn't get it working. It looks like we are using Java 8, but stormpot 3.0+ requires Java 11 (see their changelog). We can upgrade once we moved completely to Java 11, however I wasn't able to get this working as well.