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View Code? Open in Web Editor NEWExpress JS middleware to help push metrics and checks to Prometheus
Express JS middleware to help push metrics and checks to Prometheus
Arguably this could be in the calling code however it might be nice to centralise it and provide a config interface.
For example, checks must run within 200ms by default but you can specify a custom timeout in the check object. Perhaps failing to run within the timeout calls the warning callback?
const postgresCheck = {
name: 'postgres',
check: (ok, warning, critical) => {
pg.query.raw('SELECT version();', [])
.then(ok)
.catch(critical);
},
timeout: 500 // check needs a little longer than the default to run
};
Overall goal here is to prevent a request from waiting indefinitely if theres a problem with the check code itself.
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