feat: Add custom health check for Druid operator

resource_customizations/druid.apache.org/Druid/health.lua

@@ -0,0 +1,35 @@
+local hs = {}
+
+if obj.status == nil then
+  hs.status = "Progressing"
+  hs.message = "Waiting for Druid status"
+  return hs
+end
+
+if obj.status.druidNodeStatus ~= nil then
+  local nodeStatus = obj.status.druidNodeStatus
+
+  if nodeStatus.druidNodeConditionType == "DruidClusterReady" and nodeStatus.druidNodeConditionStatus == "True" then
+    hs.status = "Healthy"
+    hs.message = nodeStatus.reason or "Druid cluster is ready"
+    return hs
+  end
+
+  if nodeStatus.druidNodeConditionType == "DruidNodeErrorState" then
+    hs.status = "Degraded"
+    local podName = nodeStatus.druidNode or "unknown"
+    local reason = nodeStatus.reason or "Pod is not ready"
+    hs.message = "Pod " .. podName .. ": " .. reason
+    return hs
+  end
+
+  if nodeStatus.druidNodeConditionStatus == "False" then
+    hs.status = "Degraded"
+    hs.message = nodeStatus.reason or "Druid cluster is not ready"
+    return hs
+  end
+end
+
+hs.status = "Progressing"
+hs.message = "Druid cluster is being provisioned"
+return hs

resource_customizations/druid.apache.org/Druid/health_test.yaml

@@ -0,0 +1,25 @@
+tests:
+- healthStatus:
+    status: Healthy
+    message: All Druid Nodes are in Ready Condition
+  inputPath: testdata/healthy.yaml
+
+- healthStatus:
+    status: Degraded
+    message: "Pod druid-test-historicals-0: ContainersNotReady"
+  inputPath: testdata/degraded.yaml
+
+- healthStatus:
+    status: Degraded
+    message: Some pods are not ready
+  inputPath: testdata/degraded_condition_false.yaml
+
+- healthStatus:
+    status: Progressing
+    message: Waiting for Druid status
+  inputPath: testdata/progressing.yaml
+
+- healthStatus:
+    status: Progressing
+    message: Druid cluster is being provisioned
+  inputPath: testdata/progressing_with_partial_status.yaml

resource_customizations/druid.apache.org/Druid/testdata/current-error.yaml

@@ -0,0 +1,11 @@
+apiVersion: druid.apache.org/v1alpha1
+kind: Druid
+metadata:
+  name: druid-sandbox
+  namespace: druid-sandbox
+status:
+  druidNodeStatus:
+    druidNode: druid-druid-sandbox-routers-676fccd99d-sgs97
+    druidNodeConditionStatus: "True"
+    druidNodeConditionType: DruidNodeErrorState
+    reason: ContainersNotReady

resource_customizations/druid.apache.org/Druid/testdata/degraded.yaml

@@ -0,0 +1,27 @@
+apiVersion: druid.apache.org/v1alpha1
+kind: Druid
+metadata:
+  name: druid-test
+  namespace: druid-test
+spec:
+  image: apache/druid:latest
+  nodes:
+    coordinators:
+      kind: Deployment
+      nodeType: coordinator
+      replicas: 1
+      druid.port: 8081
+    historicals:
+      kind: StatefulSet
+      nodeType: historical
+      replicas: 1
+      druid.port: 8083
+status:
+  druidNodeStatus:
+    druidNode: druid-test-historicals-0
+    druidNodeConditionStatus: "True"
+    druidNodeConditionType: DruidNodeErrorState
+    reason: ContainersNotReady
+  pods:
+  - druid-test-coordinators-0
+  - druid-test-historicals-0

resource_customizations/druid.apache.org/Druid/testdata/degraded_condition_false.yaml

@@ -0,0 +1,21 @@
+apiVersion: druid.apache.org/v1alpha1
+kind: Druid
+metadata:
+  name: druid-test
+  namespace: druid-test
+spec:
+  image: apache/druid:latest
+  nodes:
+    coordinators:
+      kind: Deployment
+      nodeType: coordinator
+      replicas: 1
+      druid.port: 8081
+status:
+  druidNodeStatus:
+    druidNode: All
+    druidNodeConditionStatus: "False"
+    druidNodeConditionType: DruidClusterReady
+    reason: Some pods are not ready
+  pods:
+  - druid-test-coordinators-0

resource_customizations/druid.apache.org/Druid/testdata/healthy.yaml

@@ -0,0 +1,33 @@
+apiVersion: druid.apache.org/v1alpha1
+kind: Druid
+metadata:
+  name: druid-test
+  namespace: druid-test
+spec:
+  image: apache/druid:latest
+  nodes:
+    coordinators:
+      kind: Deployment
+      nodeType: coordinator
+      replicas: 1
+      druid.port: 8081
+    brokers:
+      kind: Deployment
+      nodeType: broker
+      replicas: 1
+      druid.port: 8082
+    historicals:
+      kind: StatefulSet
+      nodeType: historical
+      replicas: 1
+      druid.port: 8083
+status:
+  druidNodeStatus:
+    druidNode: All
+    druidNodeConditionStatus: "True"
+    druidNodeConditionType: DruidClusterReady
+    reason: All Druid Nodes are in Ready Condition
+  pods:
+  - druid-test-coordinators-0
+  - druid-test-brokers-0
+  - druid-test-historicals-0

resource_customizations/druid.apache.org/Druid/testdata/progressing.yaml

@@ -0,0 +1,13 @@
+apiVersion: druid.apache.org/v1alpha1
+kind: Druid
+metadata:
+  name: druid-test
+  namespace: druid-test
+spec:
+  image: apache/druid:latest
+  nodes:
+    coordinators:
+      kind: Deployment
+      nodeType: coordinator
+      replicas: 1
+      druid.port: 8081

resource_customizations/druid.apache.org/Druid/testdata/progressing_with_partial_status.yaml

@@ -0,0 +1,16 @@
+apiVersion: druid.apache.org/v1alpha1
+kind: Druid
+metadata:
+  name: druid-test
+  namespace: druid-test
+spec:
+  image: apache/druid:latest
+  nodes:
+    coordinators:
+      kind: Deployment
+      nodeType: coordinator
+      replicas: 1
+      druid.port: 8081
+status:
+  pods:
+  - druid-test-coordinators-0

resource_customizations/druid.apache.org/Druid/testdata/replica_mismatch.yaml

@@ -0,0 +1,21 @@
+apiVersion: druid.apache.org/v1alpha1
+kind: Druid
+metadata:
+  name: druid-test
+  namespace: druid-test
+spec:
+  image: apache/druid:latest
+  nodes:
+    historicals:
+      kind: StatefulSet
+      nodeType: historical
+      replicas: 3
+      druid.port: 8083
+status:
+  druidNodeStatus:
+    druidNode: All
+    druidNodeConditionStatus: "True"
+    druidNodeConditionType: DruidClusterReady
+    reason: All Druid Nodes are in Ready Condition
+  pods:
+  - druid-test-historicals-0