Skip CPU temperatures from unbooted EUREKA node BMCs

A node whose BMC is not reporting returns Reading 0 from its
temperature sensors, dragging averages down with meaningless
values. The ComputerSystem Oem data flags this via HasBMCMetrics;
skip such nodes, and keep collecting when the flag is absent.

confluent_server/aiohmi/redfish/oem/megware/eureka.py

@@ -86,7 +86,9 @@ class OEMHandler(generic.OEMHandler):
         """Read CPU temperatures from EUREKA BMC sensor endpoints.
 
         Reads BMC{N}CPU0Temp and BMC{N}CPU1Temp sensors from
-        /redfish/v1/Chassis/1/Sensors/.
+        /redfish/v1/Chassis/1/Sensors/. Nodes whose BMC is not
+        currently reporting (HasBMCMetrics false) are skipped, as
+        their sensors read a meaningless 0.
         """
         cputemps = []
         for sysurl in self._allsysurls:
@@ -94,6 +96,13 @@ class OEMHandler(generic.OEMHandler):
             nodeid = nodeid.replace('Node', '')
             if not nodeid.isdigit():
                 continue
+            try:
+                sysinfo = await fishclient._do_web_request(sysurl)
+            except Exception:
+                continue
+            if not sysinfo.get('Oem', {}).get('Megware', {}).get(
+                    'HasBMCMetrics', True):
+                continue
             for cpu in ('CPU0', 'CPU1'):
                 try:
                     sensor_url = '/redfish/v1/Chassis/1/Sensors/BMC{}{}Temp'.format(nodeid, cpu)