Always use UNKNOWN as fallback operation name for

Using `unknown` instead of `anonymous` to avoid confusion with an
unauthenticated user when an operation name was not
provided. Unrecognized operation names remain the same.

lib/gitlab/graphql/known_operations.rb

@@ -14,7 +14,6 @@ module Gitlab
         end
       end
 
-      ANONYMOUS = Operation.new("anonymous").freeze
       UNKNOWN = Operation.new("unknown").freeze
 
       def self.default
@@ -24,7 +23,7 @@ module Gitlab
       def initialize(operation_names)
         @operation_hash = operation_names
           .map { |name| Operation.new(name).freeze }
-          .concat([ANONYMOUS, UNKNOWN])
+          .concat([UNKNOWN])
           .index_by(&:name)
       end
 
@@ -32,7 +31,7 @@ module Gitlab
       def from_query(query)
         operation_name = query.selected_operation_name
 
-        return ANONYMOUS unless operation_name
+        return UNKNOWN unless operation_name
 
         @operation_hash[operation_name] || UNKNOWN
       end

spec/lib/gitlab/graphql/known_operations_spec.rb

@@ -19,7 +19,6 @@ RSpec.describe Gitlab::Graphql::KnownOperations do
 
   describe "#from_query" do
     where(:query_string, :expected) do
-      "query { helloWorld }"         | described_class::ANONYMOUS
       "query fuzzyyy { helloWorld }" | described_class::UNKNOWN
       "query foo { helloWorld }"     | described_class::Operation.new("foo")
     end
@@ -35,13 +34,13 @@ RSpec.describe Gitlab::Graphql::KnownOperations do
 
   describe "#operations" do
     it "returns array of known operations" do
-      expect(subject.operations.map(&:name)).to match_array(%w(anonymous unknown foo bar))
+      expect(subject.operations.map(&:name)).to match_array(%w(unknown foo bar))
     end
   end
 
   describe "Operation#to_caller_id" do
     where(:query_string, :expected) do
-      "query { helloWorld }"         | "graphql:#{described_class::ANONYMOUS.name}"
+      "query { helloWorld }"         | "graphql:#{described_class::UNKNOWN.name}"
       "query foo { helloWorld }"     | "graphql:foo"
     end
 

spec/lib/gitlab/metrics/rails_slis_spec.rb

@@ -28,7 +28,7 @@ RSpec.describe Gitlab::Metrics::RailsSlis do
         }
       ]
 
-      possible_graphql_labels = ['graphql:foo', 'graphql:bar', 'graphql:unknown', 'graphql:anonymous'].map do |endpoint_id|
+      possible_graphql_labels = ['graphql:foo', 'graphql:bar', 'graphql:unknown'].map do |endpoint_id|
         {
           endpoint_id: endpoint_id,
           feature_category: nil,

spec/requests/api/graphql_spec.rb

@@ -15,7 +15,7 @@ RSpec.describe 'GraphQL' do
       let(:expected_execute_query_log) do
         {
           "correlation_id" => kind_of(String),
-          "meta.caller_id" => "graphql:anonymous",
+          "meta.caller_id" => "graphql:unknown",
           "meta.client_id" => kind_of(String),
           "meta.feature_category" => "not_owned",
           "meta.remote_ip" => kind_of(String),