The daemons now announce their "compat version" through the heartbeats.
If a daemon notices the cluster members have different compat versions, it disables ha orchestration.
This is what happens during a rolling agent upgrade.
In this case, the logs contain this warning
cluster members run incompatible versions. disable ha orchestration
A orchestrate=ha service instance print status shows:
ha1 warn incompatible versions `- aubergine up idle, started |- ip#0 ...... up 126.96.36.199@lo |- ip#1 M....S stdby up 188.8.131.52@lo ...
And svcmon shows:
Nodes aubergine nuc 15m | 0.4 0.1 compat warn | 2 1 state | ...
When the compat is restored, the logs contain this info
cluster members run compatible versions. enable ha orchestration