feat(health): add healthchecks for Gloo resources (#11379)

* feat(custom healthchecks): add healthchecks for Gloo resources

Signed-off-by: Ilya Gorban <zelig81@users.noreply.github.com>

* fix(gloo custom healthchecks): fix healthcheck and add older cases

Signed-off-by: Ilya Gorban <zelig81@users.noreply.github.com>

* feat(custom healthchecks): fix tabulation in Gloo resources lua files

Signed-off-by: Ilya Gorban <zelig81@users.noreply.github.com>

---------

Signed-off-by: Ilya Gorban <zelig81@users.noreply.github.com>
Co-authored-by: Michael Crenshaw <350466+crenshaw-dev@users.noreply.github.com>

Author: zelig81

resource_customizations/gateway.solo.io/Gateway/health.lua

@@ -0,0 +1,54 @@
+hs = {
+  status = "Progressing",
+  message = "Update in progress"
+}
+
+function getStatus(status)
+  -- Accepted
+  if status.state == "Accepted" or status.state == 1 then
+    hs.status = "Healthy"
+    hs.message = "The resource has been validated"
+    return hs
+  end
+
+  -- Warning
+  if status.state == "Warning" or status.state == 3 then
+    hs.status = "Degraded"
+    hs.message = status.reason
+    return hs
+  end
+
+  -- Pending
+  if status.state == "Pending" or status.state == 0 then
+    hs.status = "Suspended"
+    hs.message = "The resource has not yet been validated"
+    return hs
+  end
+
+  -- Rejected
+  if status.state == "Rejected" or status.state == 2 then
+    hs.status = "Degraded"
+    hs.message = status.reason
+    return hs
+  end
+
+  return hs
+end
+
+if obj.status ~= nil then
+  -- Namespaced version of status
+  if obj.status.statuses ~= nil then
+    for i, namespace in pairs(obj.status.statuses) do
+      hs = getStatus(namespace)
+      if hs.status ~= "Progressing" then
+        return hs
+      end
+    end
+  end
+
+  -- Older non-namespaced version of status
+  if obj.status.state ~= nil then
+    hs = getStatus(obj.status)
+  end
+end
+return hs

resource_customizations/gateway.solo.io/Gateway/health_test.yaml

@@ -0,0 +1,37 @@
+tests:
+- healthStatus:
+    status: Degraded
+    message: "message that will describe all the reasons for warning"
+  inputPath: testdata/gloo-warning.yaml
+- healthStatus:
+    status: Suspended
+    message: "The resource has not yet been validated"
+  inputPath: testdata/gloo-pending.yaml
+- healthStatus:
+    status: Healthy
+    message: "The resource has been validated"
+  inputPath: testdata/gloo-accepted.yaml
+- healthStatus:
+    status: Degraded
+    message: "message that will describe all the reasons for rejection"
+  inputPath: testdata/gloo-rejected.yaml
+- healthStatus:
+    status: Degraded
+    message: "message that will describe all the reasons for warning"
+  inputPath: testdata/non-namespaced-gloo-warning.yaml
+- healthStatus:
+    status: Suspended
+    message: "The resource has not yet been validated"
+  inputPath: testdata/non-namespaced-gloo-pending.yaml
+- healthStatus:
+    status: Healthy
+    message: "The resource has been validated"
+  inputPath: testdata/non-namespaced-gloo-accepted.yaml
+- healthStatus:
+    status: Degraded
+    message: "message that will describe all the reasons for rejection"
+  inputPath: testdata/non-namespaced-gloo-rejected.yaml
+- healthStatus:
+    status: Progressing
+    message: "Update in progress"
+  inputPath: testdata/gloo-no-status.yaml