Use same name for idle percent metric as upstream

The official HAProxy exporter plugin uses
`haproxy_process_idle_time_percent`, let's be consistent with that.

Follow-up for #236.

Signed-off-by: Matthias Rampke <[email protected]>

Author: matthiasr

haproxy_exporter.go

@@ -234,7 +234,7 @@ var (
 
 	haproxyInfo    = prometheus.NewDesc(prometheus.BuildFQName(namespace, "version", "info"), "HAProxy version info.", []string{"release_date", "version"}, nil)
 	haproxyUp      = prometheus.NewDesc(prometheus.BuildFQName(namespace, "", "up"), "Was the last scrape of HAProxy successful.", nil, nil)
-	haproxyIdlePct = prometheus.NewDesc(prometheus.BuildFQName(namespace, "idle", "percent"), "Time spent waiting for events instead of processing them.", nil, nil)
+	haproxyIdlePct = prometheus.NewDesc(prometheus.BuildFQName(namespace, "process_idle_time", "percent"), "Time spent waiting for events instead of processing them.", nil, nil)
 )
 
 // Exporter collects HAProxy stats from the given URI and exports them using

test/unix_domain.metrics

@@ -81,6 +81,6 @@ haproxy_up 1
 # HELP haproxy_version_info HAProxy version info.
 # TYPE haproxy_version_info gauge
 haproxy_version_info{release_date="test date",version="test version"} 1
-# HELP haproxy_idle_percent Time spent waiting for events instead of processing them.
-# TYPE haproxy_idle_percent gauge
-haproxy_idle_percent 100
+# HELP haproxy_process_idle_time_percent Time spent waiting for events instead of processing them.
+# TYPE haproxy_process_idle_time_percent gauge
+haproxy_process_idle_time_percent 100