Update modules/ROOT/pages/monitoring/metrics/essential.adoc

Author: NataliaIvakina

modules/ROOT/pages/monitoring/metrics/essential.adoc

@@ -19,7 +19,7 @@ Reading the xref:performance/index.adoc[] section is recommended to better under
 
 Monitoring the hardware resources shows the strain on the server running Neo4j.
 
-You can use utilities, such as the http://www.collectd.org/[collectd] daemon or `systemd` on Linux, to gather information about the system.
+You can use utilities, such as the https://collectd.org/[collectd] daemon or `systemd` on Linux, to gather information about the system.
 These metrics can help with capacity planning as your workload grows.
 
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