What is the crowd's opinion of Alerta?

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Yes, for multiple hosts from multiple zabbix-servers on the one page.
We also found the Alerta software. It looks like it was done exactly for our purposes.
https://alerta.io/

Ya, we use Kong + an OAuth plugin for Nginx for non-prod, but our security team is weary of someone having access to write directly to prod.

&gt;> Open Distro might be exactly what I am looking for. <<

I don't think alerta.io will work since it is mostly ad hoc debugging. Thanks for the suggestion, looks a lot better than Elastalert.