[6.8] OsStats must be lenient with bad data from older nodes #73616
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We've had a series of bug fixes for cases where an OsProbe gives negative values, most often just -1, to the OsStats class. We added assertions to catch cases where we were initializing OsStats with bad values. Unfortunately, these fixes turned to not be backwards-compatible. In this commit, we simply coerce bad values to 0 when data is coming from nodes that don't have the relevant bug fixes.
Relevant PRs:
Fixes #73459
Backport of #73610