Monitor status

Hi

I've tried to search the site, but no usable pages turned up.

My question is about monitoring PostgreSQL and if it turns out to be "down" 
to notify a person to take action.

I'm surprised that I couldn't find anything about it. Does anyone have an 
advice ? Anything that will fit into ordinary NMS. Maybe SNMP will not fit, 
but then some kind of "database ping", or equal.

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