Commits on Jul 24, 2024

1. Feature: add absolute timestamp RaftMetrics::last_quorum_acked …

   `RaftMetrics::last_quorum_acked` is the absolute timestamp of the most
   recent time point that is accepted by a quorum via `AppendEntries` RPC.
   This field is a wrapped `Instant` type: `SerdeInstant` which support
   serde for `Instant`. This field is added as a replacement of
   `millis_since_quorum_ack`, which is a relative time.
   
   `SerdeInstant` serialize `Instant` into a string formatted as
   "%Y-%m-%dT%H:%M:%S%.9f%z", e.g., "2024-07-24T04:07:32.567025000+0000".
   
   Note: Serialization and deserialization are not perfectly accurate and
   can be indeterministic, resulting in minor variations each time. These
   deviations(could be smaller or greater) are typically less than a
   microsecond (10^-6 seconds).

   

   drmingdrmer committed Jul 24, 2024
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