Commits on Jan 31, 2022

1. Avoid time operations that can panic …

   We have reports of runtime panics (linkerd/linkerd2#7748) that sound a
   lot like rust-lang/rust#86470. We don't have any evidence that these
   panics originate in tower, but we have some potentialy flawed `Instant`
   arithmetic that could panic in this way.
   
   Even though this is almost definitely a bug in Rust, it seems most
   prudent to actively avoid the uses of `Instant` that are prone to this
   bug.
   
   This change replaces uses of `Instant::elapsed` and `Instant::sub` with
   calls to `Instant::saturating_duration_since` to prevent this class of
   panic. These fixes should ultimately be made in the standard library,
   but this change lets us avoid this problem while we wait for those
   fixes.
   
   See also hyperium/hyper#2746

   

   olix0r committed Jan 31, 2022
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