succd: Add metrics for RP and RP operating time

Add counter metrics that count the total operating time for the roughing
pump and the diffusion pump.

succbone/succd/process.go

@@ -81,7 +81,7 @@ func (d *daemon) process(ctx context.Context) {
 		case <-ticker.C:
 			now := time.Now()
 			var elapsed time.Duration = 0
-			if !lastRun.IsZero(){
+			if !lastRun.IsZero() {
 				elapsed = now.Sub(lastRun)
 				if elapsed > periodGrace {
 					klog.Warningf("Processing loop lag: took %s, want %s", elapsed, period)