Support open telemetry

[ejizba]

We plan to create a new package @opentelemetry/instrumentation-azure-functions that allows Open Telemetry logs, traces, and metrics to be sent from your Node.js code and properly correlated with all Azure Functions Host data for your invocations. The package will be included in @opentelemetry/auto-instrumentations-node, so that you can get all instrumentations in one place. Edit: due to open-telemetry/opentelemetry-js-contrib#2259, we shifted to an @azure package instead.

Until that package is released, you can replicate this behavior with the following code: https://github.com/ejizba/azure-functions-nodejs-opentelemetry/blob/main/src/index.ts#L24

Related to Azure/azure-functions-host#9273

[ejizba]

First version of the functions open telemetry package has been released: https://www.npmjs.com/package/@azure/functions-opentelemetry-instrumentation

GitHub repo here: https://github.com/Azure/azure-functions-nodejs-opentelemetry

I also updated our docs here: https://learn.microsoft.com/en-us/azure/azure-functions/opentelemetry-howto?tabs=otlp-export&pivots=programming-language-typescript