我无法添加promitor repo。它会引发错误 - ““https://charts.promitor.io/”不是有效的图表存储库或无法访问：解组 JSON 时出错：解码 JSON 时：json：无法将字符串解组为 repo.IndexFile 类型的 Go 值”
helm repo add promitor https://charts.promitor.io/
Error: looks like "https://charts.promitor.io/" is not a valid chart repository or cannot be reached: error unmarshaling JSON: while decoding JSON: json: cannot unmarshal string into Go value of type repo.IndexFile
按照https://artifacthub.io/packages/helm/promitor/promitor-agent-scraper添加promitor repo 。有人可以帮助我了解我是否走错了路，什么是正确的路。
➜ helm version version.BuildInfo{Version:"v3.6.3", GitCommit:"d506314abfb5d21419df8c7e7e68012379db2354", GitTreeState:"dirty", GoVersion:"go1.16.6"}