src/osd/PeeringState.cc: update last_unstale properly

Problem:

When we update the `pg_stat` we don't
check whether the pg state is in `stale`.
Therefore, the attribute `last_unstale`
will always get updated even if the pg
state actually contains `stale`.

Solution:

Place a condition to only update
the attribute `last_unstale` when
we the pg truly doesn't have `stale`
in its state.

Fixes: https://tracker.ceph.com/issues/67777

Signed-off-by: Kamoltat <[email protected]>

Author: kamoltat

src/osd/PeeringState.cc

@@ -4240,7 +4240,8 @@ std::optional<pg_stat_t> PeeringState::prepare_stats_for_publish(
       info.stats.last_active = now;
     if (info.stats.state & (PG_STATE_ACTIVE|PG_STATE_PEERED))
       info.stats.last_peered = now;
-    info.stats.last_unstale = now;
+    if ((info.stats.state & PG_STATE_STALE) == 0)
+      info.stats.last_unstale = now;
     if ((info.stats.state & PG_STATE_DEGRADED) == 0)
       info.stats.last_undegraded = now;
     if ((info.stats.state & PG_STATE_UNDERSIZED) == 0)