Merge processor issue

[bondar-aleksandr]

Hi team,

gnmic configured as below:

subscriptions:
  intf-config:
    prefix: "rfc7951:/Cisco-IOS-XE-interfaces-oper:interfaces/interface"
    stream-mode: sample
    sample-interval: 1m
    paths:
      - "oper-status"
      - "phys-address"
      - "speed"
      - "description"
      - "mtu"
      - "vrf"
      - "ipv4"
      - "ipv4-subnet-mask"
  
processors:
  trim-prefix-intf:
    event-strings:
      value-names:
        - ".*"
      transforms:
        - trim-prefix:
            apply-on: "name"
            prefix: "/rfc7951:/Cisco-IOS-XE-interfaces-oper:interfaces/interface/"
  merge-values:
    event-merge:
      always: true
      debug: true

outputs:
  file01:
    type: file
    filename: /outputs/output.txt
    format: event
    event-processors:
      - trim-prefix-intf
      - merge-values

However, output file is populated by some wierd data:

[{"name":"intf-config","timestamp":1737474240998661000,"tags":{"interface_name":"Vlan99","source":"172.18.59.1:9339","subscription-name":"intf-config"},"values":{"oper-status":"if-oper-state-ready"}}]
[{"name":"intf-config","timestamp":1737474241025068000,"tags":{"interface_name":"Vlan99","source":"172.18.59.1:9339","subscription-name":"intf-config"},"values":{"phys-address":"a0:b4:39:0d:e9:5d"}}]
[{"name":"intf-config","timestamp":1737474241045733000,"tags":{"interface_name":"Vlan99","source":"172.18.59.1:9339","subscription-name":"intf-config"},"values":{"speed":"1000000000"}}]
[{"name":"intf-config","timestamp":1737474241062160000,"tags":{"interface_name":"Vlan99","source":"172.18.59.1:9339","subscription-name":"intf-config"},"values":{"description":"Lab_Crime2"}}]
[{"name":"intf-config","timestamp":1737474241077825000,"tags":{"interface_name":"Vlan99","source":"172.18.59.1:9339","subscription-name":"intf-config"},"values":{"vrf":""}}]
[{"name":"intf-config","timestamp":1737474241092730000,"tags":{"interface_name":"Vlan99","source":"172.18.59.1:9339","subscription-name":"intf-config"},"values":{"mtu":9198}}]
[{"name":"intf-config","timestamp":1737474241107748000,"tags":{"interface_name":"Vlan99","source":"172.18.59.1:9339","subscription-name":"intf-config"},"values":{"ipv4":"10.19.15.1"}}]
[{"name":"intf-config","timestamp":1737474241123203000,"tags":{"interface_name":"Vlan99","source":"172.18.59.1:9339","subscription-name":"intf-config"},"values":{"ipv4-subnet-mask":"255.255.255.0"}}]

Only one interface is there, and values are not merged. The file is populated really slowly.

[karimra]

The merge processor works on events received as part of the same gNMI Subscribe Response.
In your case each one of those values is received in a separate gNMI Subscribe Response.