Unable to get the example remote_storage_adapter to work to send to opentsdb

[Brett]

I'm trying to get the example storage adapter for opentsdb to work. I have prometheus sending data to an AWS instance running the remote_storage_adapter binary, and also running an opentsdb server. 

I'm running opentsdb with this:

docker run -d -p 4242:4242 -v $(pwd)/opentsdb.conf:/etc/opentsdb/opentsdb.conf petergrace/opentsdb-docker

I'm running the remote storage adapter with this:

./remote_storage_adapter --web.listen-address=":80" --opentsdb-url="http://localhost:4242/" --log.level=debug

The config file is:

tsd.network.port = 4242

tsd.http.staticroot = /usr/local/share/opentsdb/static/

tsd.http.cachedir = /tmp/opentsdb

tsd.core.plugin_path = /opentsdb-plugins

tsd.core.auto_create_metrics = true

tsd.http.request.enable_chunked = true

tsd.http.request.max_chunk = 65535

I'm not getting anything in opentsdb so I looked at the remote_storage_adapter logs, and I see this error repeated:

level=warn ts=2020-09-15T16:53:56.596Z caller=main.go:330 msg="Error sending samples to remote storage" err="json: cannot unmarshal object into Go value of type int" storage=opentsdb num_samples=100

I did a packet capture and it looks like I'm getting a response from opentsdb 

HTTP/1.1 400 Bad Request

Does anyone have any ideas?

[Kallen Ding]

```

ts=2022-10-12T07:19:32.017Z caller=main.go:315 level=warn msg="Error sending samples to remote storage" err="json: cannot unmarshal object into Go value of type int" storage=opentsdb num_samples=100
ts=2022-10-12T07:19:32.017Z caller=main.go:315 level=warn msg="Error sending samples to remote storage" err="json: cannot unmarshal object into Go value of type int" storage=opentsdb num_samples=100
ts=2022-10-12T07:19:32.025Z caller=main.go:315 level=warn msg="Error sending samples to remote storage" err="json: cannot unmarshal object into Go value of type int" storage=opentsdb num_samples=100

```

Same issues met for me.