- PerfLogImp::rpcEnd(): return after the requestId-not-found UNREACHABLE
so a stale (now - epoch) duration is no longer recorded to the counter
and histogram in release builds.
- MetricsRegistry peer-version gauge: compare versions numerically via
BuildInfo::encodeSoftwareVersion() instead of a lexicographic string
compare, stripping the non-digit prefix so peer 'rippled-X.Y.Z' lines
up with our bare 'X.Y.Z'. Fixes every peer counting as higher-version.
- MetricsRegistry::stop(): call Shutdown() before ForceFlush() before
reset() so the reader thread stops before teardown and no gauge
callback fires during shutdown.
- MetricsRegistry::start(): extract initExporterAndProvider() and
initSyncInstruments() helpers to keep each function under the line
limit; no behavior change.
- time_in_current_state_seconds: read NetworkOPs::getServerStateDurationUs()
(a lightweight accessor over StateAccounting) and convert microseconds
to seconds, replacing the hardcoded 0.0.
