feat: provide historical data on Rosetta uptime via Check_MK plugin

files/usr/lib/check_mk_agent/plugins/check_rosetta_heartbeat.sh

@@ -49,10 +49,12 @@ flock -n 9 || exit 1
 
     if [[ "${RESULT}" =~ '<return>DataManagerServicesWSImpl</return>' ]]; then
         status=0
-        statustext="Rosetta is running (got correct) answer from the heartbeat API)."
+        statustext="Rosetta is running (got correct answer from the heartbeat API)."
+	perf_values="rosetta_up=1"
     else
         status=2
         statustext="Rosetta is NOT running."
+	perf_values="rosetta_up=0"
     fi
 
     echo "${status} ${itemname} ${perf_values} ${statustext}"