What is the field attribute for log_to_metric transform ?

[midnightexigent]

From example. I am not sure I understand what it does

[transforms.my_transform_id]
type = "log_to_metric"
inputs = [ "my-source-or-transform-id" ]

  [[transforms.my_transform_id.metrics]]
  type = "counter"
  field = "status" # I don't understand how it maps to the output 
  name = "response_total"
  namespace = "service"

    [transforms.my_transform_id.metrics.tags]
    status = "{{status}}"
    host = "{{host}}"

[jszwedko]

Hi @midnightexigent !

The field is the field of the event you want to operate on to generate the metric. In your example there, it is just incrementing the counter by 1, so it doesn't really matter which field you use (message is a good default). If you were generating a different metric type, like set, though, the value of the field would be used. See this example, https://vector.dev/docs/reference/configuration/transforms/log_to_metric/#examples-set, where the value of the field is added to the set metric that is generated.

[midnightexigent]

Thanks for the quick reply !