[telegraf-ds] Single bracket for single element in map list interface

[nicolas-rey]

Telegraf-ds Helm chart version: 1.1.32 Telegraf Docker image 1.29-alpine Amazon Linux on EKS

I'm trying to put processors.converter in telegraf-ds configuration.

On this processors I want to convert tags to fields, for exemple the expected config will be :

[[processors.converter]]
  namepass = ["ping"]
  [processors.converter.tags]
    string = [
      "host",
      "name",
      "url"
    ]

For this, configuration on YAML for telegraf-ds is:

config:
 # [...]
  inputs:
  processors:
    - converter:
        namepass:
          - ping
        tags:
          string:
            - host
            - name
            - url

With the actual template for telegraf-ds the result is :

[[processors.converter]]
  namepass = ["ping"]
  [[processors.converter.tags]]
    string = [
      "host"
      "name",
      "url"
    ]

Two problems here:

1. processors.converter.tags have two bracket and not one (https://github.com/influxdata/helm-charts/blob/telegraf-ds-1.1.32/charts/telegraf-ds/templates/_helpers.tpl#L228)
2. first element of string list don't have comma

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I've check on telegraf template and it's good. An If statement is in place for used single bracket with converter, override, clone and two brackets for other (https://github.com/influxdata/helm-charts/blob/telegraf-1.8.51/charts/telegraf/templates/_helpers.tpl#L342)

After check all templates and part, 3 syntaxe is present for manage map string interface :

• In telegraf-ds, processors, no statement only two brackets (https://github.com/influxdata/helm-charts/blob/telegraf-ds-1.1.32/charts/telegraf-ds/templates/_helpers.tpl#L228)

• In telegraf, processors, an if statement for single map list and for map list in 2 level (https://github.com/influxdata/helm-charts/blob/telegraf-1.8.51/charts/telegraf/templates/_helpers.tpl#L342)

• In telegraf and telegraf-ds, inputs, check if map list contain values to used two brackets and if not single brackets (https://github.com/influxdata/helm-charts/blob/telegraf-1.8.51/charts/telegraf/templates/_helpers.tpl#L204)

---

Can you used one if statement on processors in telegraf-ds for allow processors.converter ?