This flow will monitor and create alerts for CPU usage. In this flow you will learn how to install the CPU usage node and create a UI dashboard that sends alerts when CPU usage is greater than 50%
Step 1. Connect timestamp input to dashboard switch node
Drag input node and set input properties to send time stamps. Connect input node to switch dashboard node. Create a new tab and group for dashboard node. This way all dashboards can be found in a hamburger menu all in one web page.
Connect switch dashboard node to switch function node and set msg.payload is true in switch properties to indicate on switch
Step 2. Install CPU usage node
Go to manage palette and install node-red-contrib-cpu
Once installed drag CPU node and set property to :
Connect CPU node to debug node to see message for each core usage on debug panel. Connect CPU node output to chart dashboard to chart a line graph of messages from CPU. Connect a switch node and a notificiation node to alert when messages for CPU cores are greater than 50%
For chart node make sure to create a new group under CPU tab
Use a template node between a switch node and alert node to create a template for the message you want to alert :
Step 3. Create a gauge for each core
Use switch node to seperate data coming from all 4 cores. Create seperate guages to map for each core's data.
Make sure you create a separate group for the gauges . In my case the Tab is still CPU but the group is CPU guages . In the end the dashboard is all under one tab - CPU and there are 3 separate groups - CPU on and off , CPU utilization and CPU gauges .
Flow should look like this :
Deploy all changes and see dashboard . When switch is turned on , you should see 4 lines on the utilization chart , as well as different values coming in from each gauge. You should see alerts when values are greater than 50.
Import flow from here :
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This dashboard shows gauges for CPU messages
In my example I called the tab CPU and the group CPU On/Off to represent the switch
In my case I called group CPU Utilization
This template alerts which CPU core is at what percent when core is > 50
