Collect metrics in bulk and reduce monitoring performance overhead with master and dependent items.

Data collection efficiency is an important aspect of monitoring. We need to ensure that our monitoring approach has a minimal impact both on the monitoring system and the system that is being monitored.

Improve your metric collection efficiency and reduce the performance overhead with master and dependent items:

  • Dependent items can extract data from a master item by using preprocessing
  • Combine multiple preprocessing steps for best results
  • Up to 3 dependency levels are supported
  • Up to 29999 dependent items for a single master item

Check out the video to learn how to define master and dependent items

How to define master and dependent items:


  1. Navigate to ConfigurationHosts and create a new host representing your API endpoint
  2. Input the Host name, Host group, and add an arbitrary interface
  3. Click the Add button
  4. In ConfigurationHosts Click on the Items button next to the host
  5. Click the Create item button
  6. Select the Type HTTP agent and populate the URL with your API endpoint address
  7. Select the Type of informationText
  8. Click the Add button
  9. Create another item of type Dependent item
  10. Define item Key and item Name with arbitrary values
  11. Open the Preprocessing tab
  12. Use a preprocessing step (ex. JSONPath) to extract the required value from the master item
  13. Click the Add button
  14. Navigate to MonitoringLatest data and filter by your host
  15. Observe the collected metrics
Tips and best practices:
  • Dependent items don’t have their own update intervals
  • Dependent item values get updated as soon as the master item receives a new value
  • Deleting a master item will also delete the items that depend on it
  • Item of any type can be used as a master item
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