The telegraf-operator being used in this helm chart is still pointing to this archived repository - https://github.com/influxdata/telegraf-operator
See reference here - https://github.com/influxdata/helm-charts/blob/master/charts/telegraf-operator/Chart.yaml#L20C7-L20C54
Instead the helm chart should refer to the telegraf operator in InfluxCommunity which is still being maintained - https://github.com/InfluxCommunity/telegraf-operator