The official templates for RabbitMQ (at least, RabbitMQ cluster by Zabbix agent for Zabbix v6) has the following issues:

• it has 3 LLD rules, each of them has "Dependent" type;
• each master item for these LLD has update interval 1 minute;
• in result, each of these LLD runs every minute; however, the most of it configuration usually changes rarely.

The proposed enhancements:

• for the "Health check <version> discovery" LLD rules just to add once more preprocessing step with Throttling type (Discard unchanged with heartbeat) and interval "1h";
• for the "Queues discovery" LLD rule add 2 preprocessing rules:
  • the JavaScript with the following code:

    //return only needed static properties
    return JSON.stringify(JSON.parse(value),['node','name','vhost']);
    

    This code will transform the source big JSON into very compact format containing only necessary for LLD information (that is usually static enough and rarely changed);

  • again, the preprocessing step with Throttling type (Discard unchanged with heartbeat) and interval "1h".

It will dramatically decrease a load to the LLD processes.

(by the way, the same solution already proposed at the forum more than 3 years ago)