Sequel instrumentation adapter

[mwear]

Convert Datadog instrumentation for Sequel to OpenTelemetry.

See

• Datadog porting guide
• Semantic Conventions
• Datadog implementation

[ryanwi]

• Datadog porting guide

This Datadog porting guide link is broken, updated url is https://github.com/open-telemetry/opentelemetry-ruby/blob/main/instrumentation/datadog-porting-guide.md (I think)

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[jrgns]

Updated link to the porting guide: https://github.com/open-telemetry/opentelemetry-ruby-contrib/blob/main/instrumentation/datadog-porting-guide.md

[qnm]

Is anyone working on this? I need it to migrate from beelines to otel, so may do it if no-one else is doing it!

[arielvalentin]

@qnm Thank you for being willing to help!

We have very limited capacity and are in need of additional maintainers to help with instrumentation.

Please open a PR at your earliest convenience!

[jrgns]

@qnm I just created a PR for it - #672

[github-actions]

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