add path label to rapl collector (prometheus#2146)

Signed-off-by: binjip978 <[email protected]>

Author: Sergei Semenchuk

collector/fixtures/e2e-output.txt

@@ -3016,10 +3016,10 @@ node_qdisc_requeues_total{device="eth0",kind="pfifo_fast"} 2
 node_qdisc_requeues_total{device="wlan0",kind="fq"} 1
 # HELP node_rapl_core_joules_total Current RAPL core value in joules
 # TYPE node_rapl_core_joules_total counter
-node_rapl_core_joules_total{index="0"} 118821.284256
+node_rapl_core_joules_total{index="0",path="collector/fixtures/sys/class/powercap/intel-rapl:0:0"} 118821.284256
 # HELP node_rapl_package_joules_total Current RAPL package value in joules
 # TYPE node_rapl_package_joules_total counter
-node_rapl_package_joules_total{index="0"} 240422.366267
+node_rapl_package_joules_total{index="0",path="collector/fixtures/sys/class/powercap/intel-rapl:0"} 240422.366267
 # HELP node_schedstat_running_seconds_total Number of seconds CPU spent running a process.
 # TYPE node_schedstat_running_seconds_total counter
 node_schedstat_running_seconds_total{cpu="0"} 2.045936778163039e+06

collector/rapl_linux.go

@@ -11,6 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+//go:build !norapl
 // +build !norapl
 
 package collector
@@ -81,14 +82,15 @@ func (c *raplCollector) Update(ch chan<- prometheus.Metric) error {
 		descriptor := prometheus.NewDesc(
 			prometheus.BuildFQName(namespace, "rapl", rz.Name+"_joules_total"),
 			"Current RAPL "+rz.Name+" value in joules",
-			[]string{"index"}, nil,
+			[]string{"index", "path"}, nil,
 		)
 
 		ch <- prometheus.MustNewConstMetric(
 			descriptor,
 			prometheus.CounterValue,
 			float64(newMicrojoules)/1000000.0,
 			index,
+			rz.Path,
 		)
 	}
 	return nil