Fixes #31545: Add status of Rails cache to Ping API

app/services/ping.rb

@@ -7,6 +7,7 @@ def ping
       {
         'foreman': {
           database: ping_database,
+          cache: ping_cache,
         },
       }.merge(plugins_ping)
     end
@@ -47,6 +48,39 @@ def ping_database
       }
     end
 
+    def ping_cache
+      response = {}
+
+      if Rails.application.config.cache_store.first == :redis_cache_store
+        redis = Rails.cache.redis
+        response['servers'] = {}
+
+        if redis.respond_to?(:nodes)
+          nodes = redis.nodes
+        else
+          nodes = [redis]
+        end
+
+        nodes.each_with_index do |node, index|
+          start = Time.now
+
+          begin
+            node.ping
+            status = STATUS_OK
+          rescue Redis::CannotConnectError => e
+            status = STATUS_FAIL
+          ensure
+            response['servers'][index] = {
+              status: status,
+              duration_ms: duration_ms(start),
+            }
+          end
+        end
+      end
+
+      response
+    end
+
     def statuses_compute_resources
       results = []
       ComputeResource.all.index.map do |resource|