Add InstanceID in the ENV for fluentd helm charts

[vkadi]

Is your feature request related to a problem? Please describe.

I want to add new ENV to the KFO helm charts for INSTANCE_ID and I did not see a way to configure that via values.yaml.
I cannot add it like secrets as the instance_id will be dynamic based on the n number of nodes.

Tried like below under fluentd -

fluentd:
extraEnv:
- name: INSTANCE_ID
valueFrom:
fieldRef:
fieldPath: spec.providerID

or

fluentd:
extraEnv:
INSTANCE_ID: "spec.providerID | cut -d '/' -f 5"

Is there any other way I can add the ENV in the helm chart? Please suggest if there is an alternative.

Describe the solution you'd like

There should be a way to introduce new env like - https://github.com/vmware/kube-fluentd-operator/blob/main/charts/log-router/templates/daemonset.yaml#L48

Describe alternatives you've considered

N/A

Additional context

N/A

[vkadi]

@Cryptophobia @javiercri any suggestions for this issue? Is there a way to add INSTANCE_ID to ENV for pods same like K8S_NODE_NAME via values.yaml .
spec.providerID gives the output as aws:///eu-west-3c/i-0a79903e0d1904f4 and I thought using some hacks I can extract the instanceid and use it further to pass to the fluentd pod but did not have a success that route :(