Hi there,

I want to create a discovery rule and items based on a JSON file. The file looks like this:

[
   {
      "service":"app1",
      "status":"running"
   },
   {
      "service":"app2",
      "status":"running"
   },
   {
      "service":"app3",
      "status":"running"
   }
]

Based on that I and to create an item for each service which returns the status.

I made those steps:

1. Created item in template to get the JSON data
2. Created discovery rule
   • Type: "Dependent item" from the item in 1.
   • No preprocessing
   • LLD macros:
     • {{ {#SERVICENAME}

       > $[*].["service"]}}

     • {{ {#STATUS}

       }}> ${{[*].["status"]}}

   • No Filters
3. Created Item prototype
   • Name: [Discovery] Status {#SERVICENAME}
   • Type : "Dependent item" from the item in 1.
   • Key: something{#SERVICENAME}
   • Preprocessing: JSONPath:
     • $..[?(@.service == '\{#SERVICE}')].status

Now after this is done, I would expect to get something like

• [Discovery] Status app1
  • Key: something[app1]
  • Result: ["running"]
• [Discovery] Status app2
  • Key: something[app2]
  • Result: ["running"]
• [Discovery] Status app3
  • Key: something[app3]
  • Result: ["running"]

But it doesn't work because the item prototype isn't expanding the macros. This is what I get as error in the Discovery rules tab in the host:

So why is it not expanding my macros?

I was already searching for that problem and I already find related problems with "Zabbix trapper" items - but it does not apply here