package main
import (
    log "github.com/sirupsen/logrus"
    "github.com/gemnasium/logrus-graylog-hook/v3"
    )
func main() {
    hook := graylog.NewGraylogHook("<graylog_ip>:<graylog_port>", map[string]interface{}{"this": "is logged every time"})
    log.AddHook(hook)
    log.Info("some logging message")
}

package main
import (
    log "github.com/sirupsen/logrus"
    "github.com/gemnasium/logrus-graylog-hook/v3"
    )
func main() {
    hook := graylog.NewAsyncGraylogHook("<graylog_ip>:<graylog_port>", map[string]interface{}{"this": "is logged every time"})
    // NOTE: you must call Flush() before your program exits to ensure ALL of your logs are sent.
    // This defer statement will not have that effect if you write it in a non-main() method.
    defer hook.Flush()
    log.AddHook(hook)
    log.Info("some logging message")
}

type NullFormatter struct {
}
// Don't spend time formatting logs
func (NullFormatter) Format(e *log.Entry) ([]byte, error) {
    return []byte{}, nil
}

log.Infof("Log messages are now sent to Graylog (udp://%s)", graylogAddr) // Give a hint why logs are empty
log.AddHook(graylog.NewGraylogHook(graylogAddr, "api", map[string]interface{}{})) // set graylogAddr accordingly
log.SetFormatter(new(NullFormatter)) // Don't send logs to stdout