I am using serverless-plugin-datadog, which uses datadog-lambda-layer under the hood.
The docs state, that by using this plugin it is not necessary to wrap a handler anymore. This is, by the way, the main reason why I decided to go for it.
The lambda itself is a REST API, which responds with dedicated status codes.
My question now is, how can I monitor the number of 4xx and 5xx http status codes? Do I have to define custom metrics in datadog for this to work? I was under the assumption that the plugin comes with those data out-of-the-box, but it looks like I'm missing an important part here.
but it looks like I'm missing an important part here.
That was the point. The lambda itself has not much todo with particular statusCodes. So I either may log each status code and let datadog parse it accordingly.
Or, that's the solution I went for, I can leverage API-Gateway for monitoring status codes per lambda.