tomhughes left a comment (openstreetmap/openstreetmap-website#6405)
So I wanted to add it to the settings but the opentelemetry gems really, really
don't help with that and want you to use the environment :cry:
I did eventually manage to make it work after digging through the source to
find out what the gems did with the environment variables but it wasn't pretty
- there's no API call that is a direct equivalent so you wind up having to
create several objects yourself and wire them together.
Much the same goes for the `-all` thing - it is possible, and it's not quite as
bad and is at least documented but it's quite a bit more verbose.
In particular there's no way to enable `opentelemetry-instrumentation-rails`
and have it do everything so you have to do all the subcomponents of that
separately and I wound up with something like this:
```ruby
require "opentelemetry/sdk"
require "opentelemetry/instrumentation/action_mailer"
require "opentelemetry/instrumentation/action_pack"
require "opentelemetry/instrumentation/action_view"
require "opentelemetry/instrumentation/active_job"
require "opentelemetry/instrumentation/active_record"
require "opentelemetry/instrumentation/active_storage"
require "opentelemetry/instrumentation/active_support"
require "opentelemetry/instrumentation/dalli"
require "opentelemetry/instrumentation/delayed_job"
require "opentelemetry/instrumentation/faraday"
require "opentelemetry/instrumentation/pg"
require "opentelemetry/instrumentation/rack"
require "opentelemetry/instrumentation/rails"
OpenTelemetry::SDK.configure do |c|
c.use "OpenTelemetry::Instrumentation::ActionMailer"
c.use "OpenTelemetry::Instrumentation::ActionPack"
c.use "OpenTelemetry::Instrumentation::ActionView"
c.use "OpenTelemetry::Instrumentation::ActiveJob"
c.use "OpenTelemetry::Instrumentation::ActiveRecord"
c.use "OpenTelemetry::Instrumentation::ActiveStorage"
c.use "OpenTelemetry::Instrumentation::ActiveSupport"
c.use "OpenTelemetry::Instrumentation::Dalli"
c.use "OpenTelemetry::Instrumentation::DelayedJob"
c.use "OpenTelemetry::Instrumentation::Faraday"
c.use "OpenTelemetry::Instrumentation::PG"
c.use "OpenTelemetry::Instrumentation::Rack"
c.use "OpenTelemetry::Instrumentation::Rails"
end
```
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