Add support for LLM Observability

[maherio]

Expected Behavior

Lambdas can be instrumented for LLM Observability automatically with a simple flag like:

const datadogLambda = new DatadogLambda(this, "datadogLambda", {
    ...
    enableLlmObservability: true,
    ...
});

Actual Behavior

We have to manually instrument each lambda

Steps to Reproduce the Problem

n/a

Specifications

n/a

Stacktrace

n/a

[avangelillo]

@maherio thanks for opening this issue, we've added those environment variables. Support for this starts in version 2.7.0. You can specify the same parameters as the cli setup, like the following:

const datadogLambda = new DatadogLambda(this, "datadogLambda", {
    ...
    llmObsEnabled: true,
    llmObsMlApp: "myLLMApp",
    llmObsAgentlessEnabled: false,
    ...
});