Fix invalid log message format
Currently metrics starting log is not correctly formatted as:
```
$ kubectl  -n knative-eventing logs eventing-controller-756d56fc7-g64cd
...
{"level":"info" ..snip.. "caller":"controller/main.go:140","msg":"Starting metrics listener at %s:9090","knative.dev/controller":"controller"}
```
This patch makes a tiny change to fix it, which replaces `logger.Info`
with `logger.Infof`.
@@ -137,7 +137,7 @@ func main() {
srv := &http.Server{Addr: metricsScrapeAddr}
http.Handle(metricsScrapePath, promhttp.Handler())
go func() {
- logger.Info("Starting metrics listener at %s", metricsScrapeAddr)
+ logger.Infof("Starting metrics listener at %s", metricsScrapeAddr)
if err := srv.ListenAndServe(); err != nil {
logger.Infof("Httpserver: ListenAndServe() finished with error: %s", err)
}
