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Description
The topic was already addresses 8 years ago Support for secrets set in ENV variables
As already mentioned in the original issue, this is a feature supported by many other tools, including prometheus, snmp-exporter, ...
It seems that the contributor was completely missing the point of the proposal and got stuck on "Alertmanager is not a CM" which was never the subject. The request is to make alertmanager's configuration work like other configuration of prometheus stack.