RequestLock used a bare println to report transient lock acquisition failures
('lock: already locked by ...'), which writes directly to stdout instead of
going through the structured logging pipeline. This causes log noise at the
wrong level and cannot be filtered with -v or redirected like glog output.
Changes:
- println("lock:", ...) -> glog.V(2).Infof for per-retry acquisition errors
(transient, high-frequency during startup when another instance still holds)
- Add glog.V(1).Infof when the lock is successfully acquired
- Add glog.V(2).Infof for successful renewals (replaces commented-out println)
- Errorf -> Warningf for renewal failures (the goroutine exits cleanly, it is
not a fatal error; the caller will re-acquire via RequestLock)
Co-authored-by: Anton Ustyugov <anton@devops>
8e7b15a995