Veneur does not like New Relic Insert Key config

[andrelop]

We are trying to evaluate Veneur, specially Venur New Relic sink to send metrics to our New Relic account.
We are trying to use Veneur under Kubernetes as a deployment. The relevant config is basically :

        env:
        - name: VENEUR_NEWRELICACCOUNTID
          value: "<our account id here>"
        - name: VENEUR_NEWRELICINSERTKEY
          value: "<our insert key here>"
        - name: VENEUR_DEBUG
          value: "true"

However, whenever we try to start one pod using the configuration above, we get the following error on Veneur's pod logs :

time="2022-05-20T21:37:22Z" level=info msg="started New Relic sink" accountID=<our account id here> eventType=veneur metric_sink=newrelic serviceCheckEventType=veneurCheck
time="2022-05-20T21:37:22Z" level=info msg="Creating SignalFx sink signalfx" endpoint_base="https://ingest.signalfx.com" metric_sink=signalfx
time="2022-05-20T21:37:22Z" level=fatal msg="Could not initialize server" error="1 error(s) decoding:\n\n* error decoding 'insert_key': invalid type map[string]interface {}"

We tried using old insert keys, generating new ones, tried using insert keys and license keys, bit we are always getting this same error.

We are using Veneur version 14.2.0, more precisely the container image stripe/veneur:14.2.0.

Is there a know way to fix this issue ?

Also, on New Relic docs, a insert key seems to be not recommended anymore. They seem to recommend using a license key instead.

Do you have plans on supporting license keys instead of insert keys ?