Node resource analyzer

examples/preflight/node-resources.yaml

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+apiVersion: troubleshoot.replicated.com/v1beta1
+kind: Preflight
+metadata:
+  name: sample
+spec:
+  analyzers:
+    - nodeResources:
+        checkName: Must have at least 3 nodes in the cluster
+        outcomes:
+          - fail:
+              when: "< 3"
+              message: This application requires at least 3 nodes
+          - warn:
+              when: "< 5"
+              message: This application recommends at last 5 nodes.
+          - pass:
+              message: This cluster has enough nodes.
+    - nodeResources:
+        checkName: Must have 3 nodes with at least 6 cores
+        filters:
+          cpuCapacity: "6"
+        outcomes:
+          - fail:
+              when: "< 3"
+              message: This application requires at least 3 nodes with 6 cores each
+          - pass:
+              message: This cluster has enough nodes with enough codes
+    - nodeResources:
+        checkName: Must have 1 node with 16 GB (available) memory and 5 cores (on a single node)
+        filters:
+          allocatableMemory: 16Gi
+          cpuCapacity: "5"
+        outcomes:
+          - fail:
+              when: "< 1"
+              message: This application requires at least 1 node with 16GB available memory
+          - pass:
+              message: This cluster has a node with enough memory.