a code example that enables custom GraphQL tracing on NewRelic

custom_graphql_newrelic_tracing.rb

class CustomGraphqlNewrelicTracing < GraphQL::Tracing::NewRelicTracing
  # We need to create a singleton method here that inherit from the original/parent class.
  self.platform_keys = GraphQL::Tracing::NewRelicTracing.platform_keys

  # This is the only method we need to overwrite. 
  def platform_trace(platform_key, key, data)
    if key == 'execute_query'
      operation = data[:query].selected_operation
      
      # Possible type: 'query', 'mutation', 'subscription'
      type = operation.operation_type
      
      # Differentiating GraphQL routes by the root field(s) name
      field_key = operation.children&.map(&:name)&.join('.')

      # (optional) 
      # - To log the the full query string, we can leverage the
      #   `add_custom_attributes` provided by NewRelic Ruby agent.
      # - Below is a pre-processing of the original query string, in order
      #   to make sure the size is within the limit of 255 bytes.
      #   (see https://docs.newrelic.com/docs/insights/insights-data-sources/
      #   custom-data/insights-custom-data-requirements-limits).
      query_str = operation.to_query_string.gsub(/[ \n]*/, '')

      ::NewRelic::Agent.set_transaction_name("GraphQL/#{type}/#{field_key}")
      ::NewRelic::Agent.add_custom_attributes({ query: query_str })
    end

    NewRelic::Agent::MethodTracerHelpers.trace_execution_scoped(platform_key) do
      yield
    end
  end
end

root_schema.rb

require 'path/to/custom_graphql_newrelic_tracing'

class RootSchema < GraphQL::Schema
  # ... (omitting unrelated parts)

  # Using the custom NewRelic tracing plugin to trace transactions on NewRelic with more granularity.
  use CustomGraphqlNewrelicTracing
end