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Alerts duplication in HA mode

6

**What did you do?** Stack used: multiple vmalert (VictoriaMetrics) and several Alertmanager instances in HA cluster mode. When there is a large number of alerts, duplicates of some alerts begin...

fix: alerts duplication in HA cluster mode

6

#4152 There is fix for duplicates in HA cluster mode & reduce for broadcasting several times exactly same state. `!cluster.OversizedMessage(b)` is not necessary here: On current release version (0.27.0) -...