Logrus hook to expose the number of log messages as Prometheus metrics:
log_messages{level="debug"}
log_messages{level="info"}
log_messages{level="warning"}
log_messages{level="error"}
Sample code:
package main
import (
"net/http"
"time"
"github.com/prometheus/client_golang/prometheus/promhttp"
log "github.com/sirupsen/logrus"
"github.com/weaveworks/promrus"
)
func main() {
// Create the Prometheus hook:
hook := promrus.MustNewPrometheusHook()
// Configure logrus to use the Prometheus hook:
log.AddHook(hook)
// Expose Prometheus metrics via HTTP, as you usually would:
go http.ListenAndServe(":8080", promhttp.Handler())
// Log with logrus, as you usually would.
// Every time the program generates a log message, a Prometheus counter is incremented for the corresponding level.
for {
log.Infof("foo")
time.Sleep(1 * time.Second)
}
}Run the above program:
$ go get -u github.com/golang/dep/cmd/dep
$ dep ensure
$ go run main.go
INFO[0000] foo
INFO[0001] foo
INFO[0002] foo
[...]
INFO[0042] foo
Scrape the Prometheus metrics exposed by the hook:
$ curl -fsS localhost:8080 | grep log_messages
# HELP log_messages Total number of log messages.
# TYPE log_messages counter
log_messages{level="debug"} 0
log_messages{level="error"} 0
log_messages{level="info"} 42
log_messages{level="warning"} 0
$ go get github.com/golang/dep/cmd/dep
$ dep ensure
$ go build
$ go test
DEBU[0000] this is at debug level!
INFO[0000] this is at info level!
WARN[0000] this is at warning level!
ERRO[0000] this is at error level!
PASS
ok github.com/weaveworks/promrus 0.011s
If you have any questions about, feedback for or problems with promrus:
- Invite yourself to the Weave Users Slack.
- Ask a question on the #general slack channel.
- File an issue.
Weaveworks follows the CNCF Code of Conduct. Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by contacting a Weaveworks project maintainer, or Alexis Richardson ([email protected]).
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