feat: add health-checks for Percona XtraDB cluster (#13093)

* feat: Add health-checks for Percona XtraDB cluster

Signed-off-by: Thomas Decaux <ebuildy@gmail.com>
Signed-off-by: ebuildy <ebuildy@gmail.com>

* add tests

Signed-off-by: ebuildy <ebuildy@gmail.com>

---------

Signed-off-by: Thomas Decaux <ebuildy@gmail.com>
Signed-off-by: ebuildy <ebuildy@gmail.com>

resource_customizations/pxc.percona.com/PerconaXtraDBCluster/health.lua

@@ -0,0 +1,38 @@
+hs = {}
+if obj.status ~= nil then
+
+  if obj.status.state == "initializing" then
+    hs.status = "Progressing"
+    hs.message = obj.status.ready .. "/" .. obj.status.size .. " node(s) are ready"
+    return hs
+  end
+
+  if obj.status.state == "ready" then
+    hs.status = "Healthy"
+    hs.message = obj.status.ready .. "/" .. obj.status.size .. " node(s) are ready"
+    return hs
+  end
+
+  if obj.status.state == "paused" then
+    hs.status = "Unknown"
+    hs.message = "Cluster is paused"
+    return hs
+  end
+
+  if obj.status.state == "stopping" then
+    hs.status = "Degraded"
+    hs.message = "Cluster is stopping (" .. obj.status.ready .. "/" .. obj.status.size .. " node(s) are ready)"
+    return hs
+  end
+
+  if obj.status.state == "error" then
+    hs.status = "Degraded"
+    hs.message = "Cluster is on error: " .. table.concat(obj.status.messages, ", ")
+    return hs
+  end
+
+end
+
+hs.status = "Unknown"
+hs.message = "Cluster status is unknown. Ensure your ArgoCD is current and then check for/file a bug report: https://github.com/argoproj/argo-cd/issues"
+return hs

resource_customizations/pxc.percona.com/PerconaXtraDBCluster/health_test.yaml

@@ -0,0 +1,25 @@
+tests:
+- healthStatus:
+    status: Progressing
+    message: "0/1 node(s) are ready"
+  inputPath: testdata/initializing.yaml
+- healthStatus:
+    status: Healthy
+    message: "1/1 node(s) are ready"
+  inputPath: testdata/ready.yaml
+- healthStatus:
+    status: Unknown
+    message: "Cluster is paused"
+  inputPath: testdata/paused.yaml
+- healthStatus:
+    status: Degraded
+    message: "Cluster is stopping (1/2 node(s) are ready)"
+  inputPath: testdata/stopping.yaml
+- healthStatus:
+    status: Degraded
+    message: "Cluster is on error: we lost node"
+  inputPath: testdata/error.yaml
+- healthStatus:
+    status: Unknown
+    message: "Cluster status is unknown. Ensure your ArgoCD is current and then check for/file a bug report: https://github.com/argoproj/argo-cd/issues"
+  inputPath: testdata/unknown.yaml

resource_customizations/pxc.percona.com/PerconaXtraDBCluster/testdata/error.yaml

@@ -0,0 +1,24 @@
+apiVersion: pxc.percona.com/v1
+kind: PerconaXtraDBCluster
+metadata:
+  name: quickstart
+spec: {}
+status:
+  backup: {}
+  haproxy: {}
+  host: pxc-mysql-pxc
+  logcollector: {}
+  observedGeneration: 1
+  pmm: {}
+  proxysql: {}
+  pxc:
+    image: ''
+    ready: 1
+    size: 2
+    status: error
+    version: 8.0.21-12.1
+  ready: 1
+  size: 2
+  state: error
+  messages:
+  - we lost node

resource_customizations/pxc.percona.com/PerconaXtraDBCluster/testdata/initializing.yaml

@@ -0,0 +1,22 @@
+apiVersion: pxc.percona.com/v1
+kind: PerconaXtraDBCluster
+metadata:
+  name: quickstart
+spec: {}
+status:
+  backup: {}
+  haproxy: {}
+  host: pxc-mysql-pxc
+  logcollector: {}
+  observedGeneration: 1
+  pmm: {}
+  proxysql: {}
+  pxc:
+    image: ''
+    ready: 0
+    size: 1
+    status: initializing
+    version: 8.0.21-12.1
+  ready: 0
+  size: 1
+  state: initializing

resource_customizations/pxc.percona.com/PerconaXtraDBCluster/testdata/paused.yaml

@@ -0,0 +1,22 @@
+apiVersion: pxc.percona.com/v1
+kind: PerconaXtraDBCluster
+metadata:
+  name: quickstart
+spec: {}
+status:
+  backup: {}
+  haproxy: {}
+  host: pxc-mysql-pxc
+  logcollector: {}
+  observedGeneration: 1
+  pmm: {}
+  proxysql: {}
+  pxc:
+    image: ''
+    ready: 1
+    size: 1
+    status: paused
+    version: 8.0.21-12.1
+  ready: 1
+  size: 1
+  state: paused

resource_customizations/pxc.percona.com/PerconaXtraDBCluster/testdata/ready.yaml

@@ -0,0 +1,22 @@
+apiVersion: pxc.percona.com/v1
+kind: PerconaXtraDBCluster
+metadata:
+  name: quickstart
+spec: {}
+status:
+  backup: {}
+  haproxy: {}
+  host: pxc-mysql-pxc
+  logcollector: {}
+  observedGeneration: 1
+  pmm: {}
+  proxysql: {}
+  pxc:
+    image: ''
+    ready: 1
+    size: 1
+    status: ready
+    version: 8.0.21-12.1
+  ready: 1
+  size: 1
+  state: ready

resource_customizations/pxc.percona.com/PerconaXtraDBCluster/testdata/stopping.yaml

@@ -0,0 +1,22 @@
+apiVersion: pxc.percona.com/v1
+kind: PerconaXtraDBCluster
+metadata:
+  name: quickstart
+spec: {}
+status:
+  backup: {}
+  haproxy: {}
+  host: pxc-mysql-pxc
+  logcollector: {}
+  observedGeneration: 1
+  pmm: {}
+  proxysql: {}
+  pxc:
+    image: ''
+    ready: 1
+    size: 2
+    status: stopping
+    version: 8.0.21-12.1
+  ready: 1
+  size: 2
+  state: stopping

resource_customizations/pxc.percona.com/PerconaXtraDBCluster/testdata/unknown.yaml

@@ -0,0 +1,22 @@
+apiVersion: pxc.percona.com/v1
+kind: PerconaXtraDBCluster
+metadata:
+  name: quickstart
+spec: {}
+status:
+  backup: {}
+  haproxy: {}
+  host: pxc-mysql-pxc
+  logcollector: {}
+  observedGeneration: 1
+  pmm: {}
+  proxysql: {}
+  pxc:
+    image: ''
+    ready: 1
+    size: 1
+    status: dontknow
+    version: 8.0.21-12.1
+  ready: 1
+  size: 1
+  state: dontknow