fix(docker): EE-348: fix Docker stats when using cgroups v2 (#5609)

Signed-off-by: Sven Dowideit <sven@mini.home.org.au>

app/docker/models/container.js

@@ -79,25 +79,42 @@ export function ContainerStatsViewModel(data) {
     if (data.memory_stats.stats === undefined || data.memory_stats.usage === undefined) {
       this.MemoryUsage = this.MemoryCache = 0;
     } else {
-      this.MemoryUsage = data.memory_stats.usage - data.memory_stats.stats.cache;
+      this.MemoryCache = 0;
-      this.MemoryCache = data.memory_stats.stats.cache;
+      if (data.memory_stats.stats.cache !== undefined) {
+        // cgroups v1
+        this.MemoryCache = data.memory_stats.stats.cache;
+      }
+      this.MemoryUsage = data.memory_stats.usage - this.MemoryCache;
     }
   }
   this.PreviousCPUTotalUsage = data.precpu_stats.cpu_usage.total_usage;
   this.PreviousCPUSystemUsage = data.precpu_stats.system_cpu_usage;
   this.CurrentCPUTotalUsage = data.cpu_stats.cpu_usage.total_usage;
   this.CurrentCPUSystemUsage = data.cpu_stats.system_cpu_usage;
+  this.CPUCores = 1;
   if (data.cpu_stats.cpu_usage.percpu_usage) {
     this.CPUCores = data.cpu_stats.cpu_usage.percpu_usage.length;
+  } else {
+    if (data.cpu_stats.online_cpus !== undefined) {
+      this.CPUCores = data.cpu_stats.online_cpus;
+    }
   }
   this.Networks = _.values(data.networks);
   if (data.blkio_stats !== undefined) {
     //TODO: take care of multiple block devices
     var readData = data.blkio_stats.io_service_bytes_recursive.find((d) => d.op === 'Read');
+    if (readData === undefined) {
+      // try the cgroups v2 version
+      readData = data.blkio_stats.io_service_bytes_recursive.find((d) => d.op === 'read');
+    }
     if (readData !== undefined) {
       this.BytesRead = readData.value;
     }
     var writeData = data.blkio_stats.io_service_bytes_recursive.find((d) => d.op === 'Write');
+    if (writeData === undefined) {
+      // try the cgroups v2 version
+      writeData = data.blkio_stats.io_service_bytes_recursive.find((d) => d.op === 'write');
+    }
     if (writeData !== undefined) {
       this.BytesWrite = writeData.value;
     }