add k8s integration to 2.9 (opensearch-project#916)

Signed-off-by: YANGDB <yang.db.dev@gmail.com>

server/adaptors/integrations/__data__/repository/k8s/assets/README.md

@@ -0,0 +1,63 @@
+# K8s Dashboard Explained
+
+The following queries are used for the k8s dashboard:
+
+- Deployment names Graph:
+   - Filter: `event.domain:kubernetes AND event.dataset:kubernetes.deployment` 
+   - Query: `kubernetes.deployment.name` 
+
+
+- Available pods per deployment (done per deployment aggregation)
+  - Filter: `event.domain:kubernetes AND event.dataset:kubernetes.deployment`
+  - Query: `kubernetes.deployment.name`
+
+
+- Desired pod
+   - Filter: `event.domain:kubernetes AND event.dataset:kubernetes.deployment`
+   - Query: `kubernetes.deployment.replicas.desired`
+
+
+- Available pods
+  - Filter: `event.domain:kubernetes AND event.dataset:kubernetes.deployment`
+  - Query: `kubernetes.deployment.replicas.available`
+
+
+
+- Unavailable pods
+  - Filter: `event.domain:kubernetes AND event.dataset:kubernetes.deployment`
+  - Query: `kubernetes.deployment.replicas.unavailable`
+
+
+- Unavailable pods per deployment ( done per deployment aggregation)
+  - Filter: `event.domain:kubernetes AND event.dataset:kubernetes.deployment`
+  - Query: `kubernetes.deployment.replicas.unavailable`
+
+
+
+- CPU usage by node
+  - Filter: `event.domain:kubernetes AND (event.dataset:kubernetes.container OR event.dataset:kubernetes.node)`
+  - Query: `kubernetes.node.name` , `kubernetes.container.cpu.usage.nanocores`, `kubernetes.node.cpu.capacity.cores`
+
+
+
+- Top memory intensive pods
+  - Filter: `event.domain:kubernetes AND event.dataset:kubernetes.container`
+  - Query: `kubernetes.container._module.pod.name`, `kubernetes.container.memory.usage.bytes`
+
+
+
+- Top CPU intensive pods
+  - Filter: `event.domain:kubernetes AND event.dataset:kubernetes.container`
+  - Query: `kubernetes.container._module.pod.name`, `kubernetes.container.cpu.usage.core.ns`
+
+
+
+- Network in by node 
+  - Filter: `event.domain:kubernetes AND event.dataset:kubernetes.pod`
+  - Query:  `kubernetes.pod.network.rx.bytes`
+
+
+
+- Network out by node
+  - Filter: `event.domain:kubernetes AND event.dataset:kubernetes.pod`
+  - Query: `kubernetes.pod.network.tx.bytes`