Implementation of span.log about dd-trace-js

[rochdev]

1. Right now logs should be handled by the application itself using a custom logger (i.e. bunyan or winston). There is no specific recommendation since right now span.log is not supported.
2. There are no plans currently to support this, but we're definitely open to it if there is added value.

@colintoh What would be the expected behavior for your use case when using span.log?

[colintoh]

@rochdev thanks for getting back quickly.

Our use case

• We want to be able to get the end-to-end debugging experience in Datadog dashboard
• span.log send logs (with span context) to the datadog dashboard (https://docs.datadoghq.com/logs/)
• Datadog APM is able to link the span with the related logs. Hence, when we want to dive deeper into the specific trace in APM, we are able to view the related logs for it

[andrewsouthard1]

Hey @colintoh - we've since added the ability to both automatically/manually inject trace ids into logs - which connect logs/traces in Datadog: https://docs.datadoghq.com/tracing/connect_logs_and_traces/nodejs Let us know if you have any questions or believe we have not covered your use case.