Feature: support multiple checks for healthchecks widget (#2580)

* Change healthchecks online/offline with the original up/down

* Add group statistics to healthcheck widget

* Update healthchecks docs

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Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

src/widgets/healthchecks/widget.js

@@ -1,13 +1,12 @@
 import credentialedProxyHandler from "utils/proxy/handlers/credentialed";
 
 const widget = {
-  api: "{url}/api/v2/{endpoint}/{uuid}",
+  api: "{url}/api/v3/{endpoint}/{uuid}",
   proxyHandler: credentialedProxyHandler,
 
   mappings: {
     checks: {
       endpoint: "checks",
-      validate: ["status", "last_ping"],
     },
   },
 };