RPM probes metrics from Junos EVO

[mirceaulinic]

One Junos EVO and / or some platforms, the RPM probes have been nested under sevices > monitoring > rpm (whereas before they were under services > rpm).

I'd be tempted to open a PR with the following patch:

diff --git a/pkg/features/rpm/collector.go b/pkg/features/rpm/collector.go
index 9920084..dbd8dab 100644
--- a/pkg/features/rpm/collector.go
+++ b/pkg/features/rpm/collector.go
@@ -72,9 +72,12 @@ func (c *rpmCollector) Collect(client collector.Client, ch chan<- prometheus.Met
 func (c *rpmCollector) collect(client collector.Client, ch chan<- prometheus.Metric, labelValues []string) error {
        var x = result{}
 
-       err := client.RunCommandAndParse("show services rpm probe-results", &x)
+       err := client.RunCommandAndParse("show services monitoring rpm probe-results", &x)
        if err != nil {
-               return err
+               err := client.RunCommandAndParse("show services rpm probe-results", &x)
+               if err != nil {
+                       return err
+               }
        }

This would execute the new command, and fallback to the old style command in case of error. But that's a bit suboptimal.

However Junos preserved the RPC request get-rpm-probe-results across versions / platforms / etc., and it'd be more beneficial to use that instead of the CLI show command, but it doesn't seem like the current junos_exporter implementation would allow that?