Remove feature flags starting with `prometheus_transaction_`

Those feature flags were always enabled so we can remove them safely.

changelogs/unreleased/66150-remove-dynamically-constructed-feature-flags-starting-with-promethe.yml

+---
+title: Remove dynamically constructed feature flags starting with prometheus_transaction_
+merge_request: 32395
+author: Jacopo Beschi @jacopo-beschi
+type: changed

doc/administration/monitoring/prometheus/gitlab_metrics.md

@@ -91,33 +91,6 @@ The following metrics can be controlled by feature flags:
 |:---------------------------------------------------------------|:-------------------------------------------------------------------|
 | `gitlab_method_call_duration_seconds`                          | `prometheus_metrics_method_instrumentation`                        |
 | `gitlab_transaction_allocated_memory_bytes`                    | `prometheus_metrics_transaction_allocated_memory`                  |
-| `gitlab_transaction_event_build_found_total`                   | `prometheus_transaction_event_build_found_total`                   |
-| `gitlab_transaction_event_build_invalid_total`                 | `prometheus_transaction_event_build_invalid_total`                 |
-| `gitlab_transaction_event_build_not_found_cached_total`        | `prometheus_transaction_event_build_not_found_cached_total`        |
-| `gitlab_transaction_event_build_not_found_total`               | `prometheus_transaction_event_build_not_found_total`               |
-| `gitlab_transaction_event_change_default_branch_total`         | `prometheus_transaction_event_change_default_branch_total`         |
-| `gitlab_transaction_event_create_repository_total`             | `prometheus_transaction_event_create_repository_total`             |
-| `gitlab_transaction_event_etag_caching_cache_hit_total`        | `prometheus_transaction_event_etag_caching_cache_hit_total`        |
-| `gitlab_transaction_event_etag_caching_header_missing_total`   | `prometheus_transaction_event_etag_caching_header_missing_total`   |
-| `gitlab_transaction_event_etag_caching_key_not_found_total`    | `prometheus_transaction_event_etag_caching_key_not_found_total`    |
-| `gitlab_transaction_event_etag_caching_middleware_used_total`  | `prometheus_transaction_event_etag_caching_middleware_used_total`  |
-| `gitlab_transaction_event_etag_caching_resource_changed_total` | `prometheus_transaction_event_etag_caching_resource_changed_total` |
-| `gitlab_transaction_event_fork_repository_total`               | `prometheus_transaction_event_fork_repository_total`               |
-| `gitlab_transaction_event_import_repository_total`             | `prometheus_transaction_event_import_repository_total`             |
-| `gitlab_transaction_event_push_branch_total`                   | `prometheus_transaction_event_push_branch_total`                   |
-| `gitlab_transaction_event_push_commit_total`                   | `prometheus_transaction_event_push_commit_total`                   |
-| `gitlab_transaction_event_push_tag_total`                      | `prometheus_transaction_event_push_tag_total`                      |
-| `gitlab_transaction_event_rails_exception_total`               | `prometheus_transaction_event_rails_exception_total`               |
-| `gitlab_transaction_event_receive_email_total`                 | `prometheus_transaction_event_receive_email_total`                 |
-| `gitlab_transaction_event_remote_mirrors_failed_total`         | `prometheus_transaction_event_remote_mirrors_failed_total`         |
-| `gitlab_transaction_event_remote_mirrors_finished_total`       | `prometheus_transaction_event_remote_mirrors_finished_total`       |
-| `gitlab_transaction_event_remote_mirrors_running_total`        | `prometheus_transaction_event_remote_mirrors_running_total`        |
-| `gitlab_transaction_event_remove_branch_total`                 | `prometheus_transaction_event_remove_branch_total`                 |
-| `gitlab_transaction_event_remove_repository_total`             | `prometheus_transaction_event_remove_repository_total`             |
-| `gitlab_transaction_event_remove_tag_total`                    | `prometheus_transaction_event_remove_tag_total`                    |
-| `gitlab_transaction_event_sidekiq_exception_total`             | `prometheus_transaction_event_sidekiq_exception_total`             |
-| `gitlab_transaction_event_stuck_import_jobs_total`             | `prometheus_transaction_event_stuck_import_jobs_total`             |
-| `gitlab_transaction_event_update_build_total`                  | `prometheus_transaction_event_update_build_total`                  |
 | `gitlab_view_rendering_duration_seconds`                       | `prometheus_metrics_view_instrumentation`                          |
 
 ## Sidekiq Metrics available for Geo **(PREMIUM)**

lib/gitlab/metrics/transaction.rb

@@ -78,7 +78,7 @@ module Gitlab
       # tags - A set of tags to attach to the event.
       def add_event(event_name, tags = {})
         filtered_tags = filter_tags(tags)
-        self.class.transaction_metric(event_name, :counter, prefix: 'event_', use_feature_flag: true, tags: filtered_tags).increment(filtered_tags.merge(labels))
+        self.class.transaction_metric(event_name, :counter, prefix: 'event_', tags: filtered_tags).increment(filtered_tags.merge(labels))
         @metrics << Metric.new(EVENT_SERIES, { count: 1 }, filtered_tags.merge(event: event_name), :event)
       end
 
@@ -155,12 +155,11 @@ module Gitlab
         with_feature :prometheus_metrics_transaction_allocated_memory
       end
 
-      def self.transaction_metric(name, type, prefix: nil, use_feature_flag: false, tags: {})
+      def self.transaction_metric(name, type, prefix: nil, tags: {})
         metric_name = "gitlab_transaction_#{prefix}#{name}_total".to_sym
         fetch_metric(type, metric_name) do
           docstring "Transaction #{prefix}#{name} #{type}"
           base_labels tags.merge(BASE_LABELS)
-          with_feature "prometheus_transaction_#{prefix}#{name}_total".to_sym if use_feature_flag
 
           if type == :gauge
             multiprocess_mode :livesum

spec/lib/gitlab/metrics/transaction_spec.rb

@@ -204,17 +204,17 @@ describe Gitlab::Metrics::Transaction do
     end
 
     it 'allows tracking of custom tags' do
-      transaction.add_event(:meow, animal: 'cat')
+      transaction.add_event(:bau, animal: 'dog')
 
-      expect(metric.tags).to eq(event: :meow, animal: 'cat')
+      expect(metric.tags).to eq(event: :bau, animal: 'dog')
     end
 
     context 'with sensitive tags' do
       before do
-        transaction.add_event(:meow, **sensitive_tags.merge(sane: 'yes'))
+        transaction.add_event(:baubau, **sensitive_tags.merge(sane: 'yes'))
       end
 
-      it_behaves_like 'tag filter', event: :meow, sane: 'yes'
+      it_behaves_like 'tag filter', event: :baubau, sane: 'yes'
     end
   end
 

spec/lib/gitlab/metrics/web_transaction_spec.rb

@@ -253,11 +253,11 @@ describe Gitlab::Metrics::WebTransaction do
     end
 
     it 'allows tracking of custom tags' do
-      transaction.add_event(:meow, animal: 'cat')
+      transaction.add_event(:bau, animal: 'dog')
 
       metric = transaction.metrics[0]
 
-      expect(metric.tags).to eq(event: :meow, animal: 'cat')
+      expect(metric.tags).to eq(event: :bau, animal: 'dog')
     end
   end
 end