[installer] Add liveness probe for server

Add a liveness probe for server that fails if the nodejs event loop lag
exceeds a given threshold.

Author: Andrew Farries

install/installer/pkg/components/server/deployment.go

@@ -26,6 +26,7 @@ import (
 	"k8s.io/apimachinery/pkg/api/resource"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/util/intstr"
 	"k8s.io/utils/pointer"
 )
 
@@ -387,6 +388,20 @@ func deployment(ctx *common.RenderContext) ([]runtime.Object, error) {
 									"memory": resource.MustParse("200Mi"),
 								},
 							}),
+							LivenessProbe: &corev1.Probe{
+								ProbeHandler: corev1.ProbeHandler{
+									HTTPGet: &corev1.HTTPGetAction{
+										Path: "/live",
+										Port: intstr.IntOrString{
+											Type:   intstr.Int,
+											IntVal: ContainerPort,
+										},
+									},
+								},
+								InitialDelaySeconds: 120,
+								PeriodSeconds:       10,
+								FailureThreshold:    6,
+							},
 							SecurityContext: &corev1.SecurityContext{
 								Privileged: pointer.Bool(false),
 								RunAsUser:  pointer.Int64(31001),