The Redis instrumentation approach cannot be set to "chain" via the config file

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As per @oboxodo's documented experiences in #731 (see comment), using either instrumentation.redis: chain or instrumentation.redis_instrumentation: chain in newrelic.yml fails to instruct the agent to switch away from its default "prepend" instrumentation behavior for the redis gem over to using the "chain" approach as expected.

Using the environment variable approach of NEW_RELIC_INSTRUMENTATION_REDIS=chain does work as desired and cause "chain" to be used.

We need to investigate why the config file approaches to using "chain" with redis are not working.

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I have done some testing and left comments on #731. The correct configuration value should be instrumentation.redis: chain. With that value in the config file, the agent reports that it is using method chaining for Redis instrumentation in my testing.

I have put together a gist to help with reproducing (or not) the issue.

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Resolved by #1276 (the same community member who raised the issue!)