code: function instrumentSchemaForExpressGraphQL(schema) {
    addTracingToResolvers(schema);
    addSchemaLevelResolveFunction(schema, (root, args, ctx, info) => {
      const operation = print(info.operation);
      const fragments = Object.keys(info.fragments).map(k => print(info.fragments[k])).join('\n');
  
      ctx.tracer.log('request.query', `${operation}\n${fragments}`);
      ctx.tracer.log('request.variables', info.variableValues);
      ctx.tracer.log('request.operationName', info.operation.name);
      return root;
    });
  }
docs: This instruments a GraphQL.js schema when using tracer with express-graphql