Truncation does not always produce a small-enough payload

[brianr]

Example seen from rollbar-gem 2.12.0:

Failsafe from rollbar-gem. Could not send payload due to it being too large after truncating attempts. Original size: 81038972 Final size: 1386110

We ought to at least be able to report something more useful than that. Let's try to figure out what kind of situation this might have been, and figure out a truncation strategy that would produce something useful.

[letaniaferreira]

another one - https://app.intercom.io/a/apps/rlisg82q/inbox/inbox/488687/conversations/22216872441

[waltjones]

#872 released in 2.20.1 does more to address this, by also removing the contents of request and then extra if needed.