./namenode_exporter.go:312:28: undefined: prometheus.Handler

[luckercs]

when i run 'go build namenode_exporter.go', I got this question, How to solve this problem？

[ghost]

see https://github.com/freenetdigital/prometheus_oracle_exporter/issues/22 for a similar problem.

You need to add this import : "github.com/prometheus/client_golang/prometheus/promhttp" and replace prometheus.Handler() by promhttp.Handler()