a934bf4 Only record next-key info when we have a next-key

Authored and Committed by nalin 3 years ago
    Only record next-key info when we have a next-key
    
    Only record the number of times we've made requests for a "next key",
    and its key generation date, if we actually have a key that we're
    attempting to switch to as part of a larger rekeying operation.
    
        
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