Type mismatch issue when submitting metrics with tags.

[jayshah123]

I am seeing this warning/error when submitting metrics:

could not serialize Array<number> (TypeError: mismatch types '1731477130' and 'Array<number>')
could not serialize number (TypeError: unknown type 'number')

This seems to be coming from - https://github.com/DataDog/datadog-api-client-typescript/blob/b56725b4ac6154403442ed02fe511c27a960d000/packages/datadog-api-client-v1/models/ObjectSerializer.ts#L2494.

Debugger screenshot (breakpoint on above error message):

Is there any workaround I can try?
If this is expected behaviour, is there a way to supress these messages? I am using this lib to send metrics from a cli, where this stdout/stderr output affects the experience.

[jayshah123]

Nevermind, this was additional logging, because I was running my CLI with DEBUG=* and hence datadog api client was logging warnings.

[Mr0grog]

Ugh, that definitely is a confusing error! It looks like we are doing something wrong that is getting automatically fixed for us, so I took a deeper look. It turns out that the Datadog client logs this error even when everything is exactly correct. 😫

If you are more curious on the details, it’s trying to serialize as a type that one of a few possibilities. To do that, it actually tries to serialize as each of the possibilities and expects only one to work. Along the way, it logs about every possibility that fails, even though it expects all but one to fail. So this error message is totally normal. It’s not even meaningful as a warning. https://github.com/DataDog/datadog-api-client-typescript/blob/b56725b4ac6154403442ed02fe511c27a960d000/packages/datadog-api-client-v1/models/ObjectSerializer.ts#L2553-L2570