feat: datadog wiring (main)

[p0mvn]

Closes: #XXX

What is the purpose of the change

• Enables DataDog tracing.
• Tested and deployed on SQS in staging and production

[coderabbitai]

Walkthrough

The recent changes significantly enhance the application's observability by integrating OpenTelemetry (OTEL) for improved monitoring and tracing capabilities. Key updates include the introduction of an OTEL configuration structure, the implementation of an OTEL tracer initialization function, and enhancements to the gRPC client instrumentation. These updates enable more effective performance tracking and debugging, marking a notable advancement in the application's operational monitoring features.

Changes

File Path	Change Summary
app/.../app.go	Integrated OpenTelemetry support; added OTEL initialization function and configuration retrieval.
app/.../config.go	Introduced OTELConfig type for managing OTEL settings and a function to create this configuration.
cmd/.../cmd/root.go	Added OTEL configuration section to application initialization, allowing users to set OTEL options.
ingest/.../grpc_client.go	Enhanced gRPC client with OpenTelemetry stats handler for improved monitoring of gRPC operations.

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[coderabbitai]

Actionable comments posted: 2

Outside diff range, codebase verification and nitpick comments (1)

app/app.go (1)

1280-1281: Ensure comments are clear and accurate.

The comment mentions wiring up with the Sentry exporter, but there is no Sentry-specific code in the function.

- // and wires it up with the Sentry exporter.
+ // and sets up the tracer provider and text map propagator.