Basic Prometheus exporter for Halon SMTPD server.
It uses the control socket API to retrieve statistics from the local SMTP servers.
These are then formatted in the metrics format and served at http://localhost:9393/metrics (by default).
The following environment variables are available:
| Variable | Description |
|---|---|
| HALON_SMTPD_EXPORTER_SOCKET_PATH | Path to the control socket, default is /var/run/halon/smtpd.ctl |
| HALON_SMTPD_EXPORTER_LISTENADDR | IP:Port for the webserver, default is :9393 |
You may need to build this with the Protobuf definitions matching your smtpd version. The definitions can be found here.
Clone this repo, grab the smtpd.proto file for your version.
Install protoc-gen-go:
go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
Install protoc, for Debian/Ubuntu:
sudo apt install protobuf-compiler
Generate Golang types:
protoc -I=$(pwd) --go_out=$(pwd) --go_opt=Msmtpd.proto=pkg/halon_smtpd_ctl smtpd.proto
Now you can probably build the program:
go build -o halon-smtpd-exporter .