It’s great that checkmk is addressing this long known issue.
As diligent Opsgenie users, we have been waiting for a while for an improvement of the Opsgenie notification function so that our customers do not have to rely on self-implemented workarounds.
Your market companion from Nuremberg is already a bit further ahead and also supports reporting of acknowledgements in Opsgenie back to there monitoring system.
it was an advice of the Opsgenie team that the Checkmk notification script should use the Default API instead of the integration. The integration within Opsgenie is not provided by us, it was an old implementation and was deprecated by Opsgenie.