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Problem: There is currently no simple way to monitor the expiration time of the issuer certificate in use by linkerd; a surprising omission considering that issuer cert expiration will almost certainly cause visible cluster issues.
Solution: When a new issuer certificate is loaded, log its NotAfter time in unix epoch format, along with the current process wall clock time. The two timestamps are passed in via the logrus Fields pattern, allowing operators to easily pull these numbers from pod logs.
Fixes: #11215