ClientTracer: uninitialized constant GRPC (NameError)

[friendlyantz]

on any brand new rails app ./bin/rails assets:precompile fails due to naming error

./bin/rails assets:precompile
bin/rails aborted!
NameError: uninitialized constant GRPC (NameError)

        class ClientTracer < ::GRPC::ClientInterceptor
                             ^^^^^^
<internal:/Users/friendlyantz/.asdf/installs/ruby/3.4.2/lib/ruby/3.4.0/rubygems/core_ext/kernel_require.rb>:37:in 'Kernel#require'

Operating system details: MacOS
RUBY_ENGINE: "ruby"
RUBY_VERSION: "3.4.2"
RUBY_DESCRIPTION: "ruby 3.4.2 (2025-02-15 revision d2930f8e7a) +PRISM [arm64-darwin24]"

[indrajeet070598]

We are getting a similar issue with ruby 3.3.0. Our application builds suddenly started failing because of this.

11:01:14  [0m[91mrake aborted!
11:01:14  [0m[91mNameError: uninitialized constant GRPC (NameError)
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/opentelemetry-instrumentation-grpc-0.2.0/lib/opentelemetry/instrumentation/grpc/interceptors/client_tracer.rb:12:in `<module:Interceptors>'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/opentelemetry-instrumentation-grpc-0.2.0/lib/opentelemetry/instrumentation/grpc/interceptors/client_tracer.rb:10:in `<module:Grpc>'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/opentelemetry-instrumentation-grpc-0.2.0/lib/opentelemetry/instrumentation/grpc/interceptors/client_tracer.rb:9:in `<module:Instrumentation>'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/opentelemetry-instrumentation-grpc-0.2.0/lib/opentelemetry/instrumentation/grpc/interceptors/client_tracer.rb:8:in `<module:OpenTelemetry>'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/opentelemetry-instrumentation-grpc-0.2.0/lib/opentelemetry/instrumentation/grpc/interceptors/client_tracer.rb:7:in `<top (required)>'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/opentelemetry-instrumentation-grpc-0.2.0/lib/opentelemetry/instrumentation/grpc.rb:21:in `require_relative'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/opentelemetry-instrumentation-grpc-0.2.0/lib/opentelemetry/instrumentation/grpc.rb:21:in `<top (required)>'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/opentelemetry-instrumentation-grpc-0.2.0/lib/opentelemetry/instrumentation.rb:22:in `require_relative'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/opentelemetry-instrumentation-grpc-0.2.0/lib/opentelemetry/instrumentation.rb:22:in `<top (required)>'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/opentelemetry-instrumentation-grpc-0.2.0/lib/opentelemetry-instrumentation-grpc.rb:7:in `require_relative'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/opentelemetry-instrumentation-grpc-0.2.0/lib/opentelemetry-instrumentation-grpc.rb:7:in `<top (required)>'
11:01:14  /usr/local/lib/ruby/3.3.0/bundled_gems.rb:75:in `require'
11:01:14  /usr/local/lib/ruby/3.3.0/bundled_gems.rb:75:in `block (2 levels) in replace_require'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/opentelemetry-instrumentation-all-0.75.0/lib/opentelemetry/instrumentation/all.rb:31:in `<top (required)>'
11:01:14  /usr/local/lib/ruby/3.3.0/bundled_gems.rb:75:in `require'
11:01:14  /usr/local/lib/ruby/3.3.0/bundled_gems.rb:75:in `block (2 levels) in replace_require'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/ohai_telemetry_sdk-0.8.0/lib/ohai_telemetry_sdk.rb:6:in `<top (required)>'
11:01:14  <internal:/usr/local/lib/ruby/site_ruby/3.3.0/rubygems/core_ext/kernel_require.rb>:37:in `require'
11:01:14  <internal:/usr/local/lib/ruby/site_ruby/3.3.0/rubygems/core_ext/kernel_require.rb>:37:in `require'
11:01:14  /usr/local/lib/ruby/3.3.0/bundled_gems.rb:75:in `block (2 levels) in replace_require'
11:01:14  /usr/local/lib/ruby/site_ruby/3.3.0/bundler/runtime.rb:65:in `block (2 levels) in require'
11:01:14  /usr/local/lib/ruby/site_ruby/3.3.0/bundler/runtime.rb:60:in `each'
11:01:14  /usr/local/lib/ruby/site_ruby/3.3.0/bundler/runtime.rb:60:in `block in require'
11:01:14  /usr/local/lib/ruby/site_ruby/3.3.0/bundler/runtime.rb:52:in `each'
11:01:14  /usr/local/lib/ruby/site_ruby/3.3.0/bundler/runtime.rb:52:in `require'
11:01:14  /usr/local/lib/ruby/site_ruby/3.3.0/bundler.rb:216:in `require'
11:01:14  /opt/app/config/application.rb:14:in `<top (required)>'
11:01:14  /usr/local/lib/ruby/3.3.0/bundled_gems.rb:75:in `require'
11:01:14  /usr/local/lib/ruby/3.3.0/bundled_gems.rb:75:in `block (2 levels) in replace_require'
11:01:14  /opt/app/Rakefile:3:in `<top (required)>'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/rake-13.2.1/lib/rake/rake_module.rb:29:in `load'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/rake-13.2.1/lib/rake/rake_module.rb:29:in `load_rakefile'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/rake-13.2.1/lib/rake/application.rb:740:in `raw_load_rakefile'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/rake-13.2.1/lib/rake/application.rb:126:in `block in load_rakefile'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/rake-13.2.1/lib/rake/application.rb:214:in `standard_exception_handling'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/rake-13.2.1/lib/rake/application.rb:125:in `load_rakefile'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/rake-13.2.1/lib/rake/application.rb:82:in `block in run'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/rake-13.2.1/lib/rake/application.rb:214:in `standard_exception_handling'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/rake-13.2.1/lib/rake/application.rb:80:in `run'
11:01:14  /usr/local/bundle/ruby/3.3.0/gems/rake-13.2.1/exe/rake:27:in `<top (required)>'
11:01:14  /usr/local/bundle/ruby/3.3.0/bin/rake:25:in `load'
11:01:14  /usr/local/bundle/ruby/3.3.0/bin/rake:25:in `<top (required)>'
11:01:14  /usr/local/lib/ruby/site_ruby/3.3.0/bundler/cli/exec.rb:59:in `load'
11:01:14  /usr/local/lib/ruby/site_ruby/3.3.0/bundler/cli/exec.rb:59:in `kernel_load'
11:01:14  /usr/local/lib/ruby/site_ruby/3.3.0/bundler/cli/exec.rb:23:in `run'
11:01:14  /usr/local/lib/ruby/site_ruby/3.3.0/bundler/cli.rb:452:in `exec'
11:01:14  /usr/local/lib/ruby/site_ruby/3.3.0/bundler/vendor/thor/lib/thor/command.rb:28:in `run'
11:01:14  /usr/local/lib/ruby/site_ruby/3.3.0/bundler/vendor/thor/lib/thor/invocation.rb:127:in `invoke_command'
11:01:14  /usr/local/lib/ruby/site_ruby/3.3.0/bundler/vendor/thor/lib/thor.rb:538:in `dispatch'
11:01:14  /usr/local/lib/ruby/site_ruby/3.3.0/bundler/cli.rb:35:in `dispatch'
11:01:14  /usr/local/lib/ruby/site_ruby/3.3.0/bundler/vendor/thor/lib/thor/base.rb:584:in `start'
11:01:14  /usr/local/lib/ruby/site_ruby/3.3.0/bundler/cli.rb:29:in `start'
11:01:14  /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.2/exe/bundle:28:in `block in <top (required)>'
11:01:14  /usr/local/lib/ruby/site_ruby/3.3.0/bundler/friendly_errors.rb:117:in `with_friendly_errors'
11:01:14  /usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.2/exe/bundle:20:in `<top (required)>'
11:01:14  /usr/local/bundle/bin/bundle:108:in `load'
11:01:14  /usr/local/bundle/bin/bundle:108:in `<main>'

[arielvalentin]

@kaylareopelle @michal-kazmierczak would one of you all be able to look into this.

Require relative should not load files unless the GRPC constant is defined.

[arielvalentin]

Looks like this was fixed in #1471 but not released.

I am working on getting a patch release out now. https://github.com/open-telemetry/opentelemetry-ruby-contrib/pull/1491/files