Adds /healthz endpoint

And points k8s readiness and liveness probes on it

config/routes

@@ -8,6 +8,7 @@
 /sitemap.xml SitemapR GET
 
 / HomeR GET
+/healthz HealthzR GET
 /snapshots AllSnapshotsR GET
 
 /snapshot/#Text/*Texts OldSnapshotR GET

etc/helm/templates/deployment.yaml

@@ -32,7 +32,7 @@ spec:
                   key: PGCONN
           readinessProbe:
             httpGet:
-              path: /
+              path: /healthz
               port: 3000
               httpHeaders:
                 # Works around stackage-server's `forceSSL` redirect
@@ -44,7 +44,7 @@ spec:
             successThreshold: 1
           livenessProbe:
             httpGet:
-              path: /
+              path: /healthz
               port: 3000
               httpHeaders:
                 # Works around stackage-server's `forceSSL` redirect

etc/helm/templates/hoogle_deployment.yaml

@@ -32,7 +32,7 @@ spec:
                   key: PGCONN
           readinessProbe:
             httpGet:
-              path: /
+              path: /healthz
               port: 3000
               httpHeaders:
                 # Works around stackage-server's `forceSSL` redirect
@@ -44,7 +44,7 @@ spec:
             successThreshold: 1
           livenessProbe:
             httpGet:
-              path: /
+              path: /healthz
               port: 3000
               httpHeaders:
                 # Works around stackage-server's `forceSSL` redirect

src/Handler/Home.hs

@@ -5,6 +5,7 @@
 {-# LANGUAGE ViewPatterns #-}
 module Handler.Home
     ( getHomeR
+    , getHealthzR
     , getAuthorsR
     , getInstallR
     , getOlderReleasesR
@@ -15,6 +16,9 @@ import Import
 import Stackage.Database
 import Yesod.GitRepo (grContent)
 
+getHealthzR :: Handler String
+getHealthzR = return "OK"
+
 -- This is a handler function for the G request method on the HomeR
 -- resource pattern. All of your resource patterns are defined in
 -- config/routes