add monitoring

config/health/resources/Cache.yml

@@ -0,0 +1,10 @@
+name: Cache
+abbreviation: csh
+checker: PragmaRX\Health\Checkers\Cache
+notify: true
+error_message: "Cache is not returning cached values."
+column_size: 3
+targets:
+  - default:
+      minutes: 1
+      key: health-cache-test