Update datadog-lambda to work with ddrace gem versions >= 1.0

[Folkman]

Expected Behavior

The latest datadog-lambda gem works with the latest ddtrace gem.

Actual Behavior

The latest datadog-lambda gem doesn't work with the latest ddtrace gem.

Steps to Reproduce the Problem

1. Add the latest datadog-lambda and ddtrace gems.
2. Add an initializer with the Datadog::Lambda.configure_apm block.
3. Boot app.
4. App fails due to datadog-lambda's dependency on SyncWriter which is not supported in ddtrace versions >= 1.0.

See: https://github.com/DataDog/dd-trace-rb/blob/master/docs/UpgradeGuide.md#from-0x-to-10

This dependency can be found here:

datadog-lambda-rb/lib/datadog/lambda.rb

Line 31 in dc40377

require 'ddtrace/sync_writer'

Specifications

• Datadog Lambda Layer version: 1.14.0
• ddtrace: 1.1.0
• Ruby version: 3.0

Stacktrace

/usr/local/bundle/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require': cannot load such file -- ddtrace/sync_writer (LoadError)

[agocs]

Hi @Folkman , thanks for creating this issue. It looks like the Ruby Tracing team introduced some nontrivial breaking changes. I'll get upgrading datadog-lambda-rb scheduled.

In the meantime, your best bet is probably going to be:

• Adding the arn:aws:lambda:[REGION]:464622532012:layer:Datadog-Ruby2-7:14 layer to your lambda function. This layer includes datadog-lambda-rb and an older version of dd-trace
• Configuring your lambda function as shown in the instructions

[djpate]

Thanks, @duncanista for fixing that. Do you know if we could cut a version for this?

[duncanista]

@djpate v2.16.0 is out now! 💯

[Folkman]

Much appreciated!