Remove Explicit Dependencies on ActiveSupport Core Extentions

[arielvalentin]

Description of the bug

Rails 7.1 is no longer auto-loading some core language extensions¹, however we have a few instances of our instrumentation depending on those methods.

We must not rely on dependencies from any gem outside of the Ruby standard library.

This is causing errors for some of our end users who are in the process of upgrading to Rails 7.1:

ERROR -- : OpenTelemetry error: unexpected configuration error due to undefined method `blank?' for "eu-west-1":String - OpenTelemetry::SDK::ConfigurationError

I had replaced the usage of blank? in the gruf gem when adding test coverage for Rails 7.1 but it seems we still have references in at least the grape instrumentation.

cc: @muripic for Grape

Share details about your runtime

Ruby 3.2
Rails 7.1

Footnotes

1. https://github.com/rails/rails/commit/0170745b376acd150fec5f8cc57253cc1ffe0cf2 ↩

[muripic]

Thanks for flagging, @arielvalentin ! I'll try to submit a PR fixing this today 😃