[demo] helm install error: function "mustFromJson" not defined

[gerbil]

Documentation: https://opentelemetry.io/docs/demo/kubernetes-deployment/

Step: To install the chart with the release name my-otel-demo, run the following command:

helm install my-otel-demo open-telemetry/opentelemetry-demo

Try with

helm version
version.BuildInfo{Version:"v3.4.0-rc.1"

helm install my-otel-demo open-telemetry/opentelemetry-demo
Error: parse error at (opentelemetry-demo/templates/_pod.tpl:11): function "mustFromJson" not defined

src:
https://github.com/open-telemetry/opentelemetry-helm-charts/blob/36d6b236a92745b82858fd2e703cd5669ad23cfa/charts/opentelemetry-demo/templates/_pod.tpl

[TylerHelmuth]

@gerbil the demo prerequisites require using helm 3.9+. Can you try with a 3.9+ version of helm?