janhoy commented on code in PR #4209:
URL: https://github.com/apache/solr/pull/4209#discussion_r2927857050


##########
solr/core/src/java/org/apache/solr/metrics/OtelRuntimeJvmMetrics.java:
##########
@@ -65,6 +75,38 @@ public ContextPropagators getPropagators() {
             // TODO: We should have this configurable to enable/disable 
specific JVM metrics
             .enableAllFeatures()
             .build();
+    java.lang.management.OperatingSystemMXBean osMxBean =
+        ManagementFactory.getOperatingSystemMXBean();
+    if (osMxBean instanceof com.sun.management.OperatingSystemMXBean 
extOsMxBean) {
+      systemMemoryTotalGauge =
+          solrMetricManager.observableLongGauge(
+              registryName,
+              "jvm.system.memory",
+              "Total physical memory of the host or container in bytes."
+                  + " On Linux with cgroup limits, reflects the container 
memory limit.",
+              measurement -> {
+                long total = extOsMxBean.getTotalMemorySize();
+                if (total > 0) measurement.record(total);

Review Comment:
   Some JDKs do not support the sun API and will report -1 or maybe 0. So this 
is a guard against bad value.



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