Merge branch '342719-documentation-missing-prometheus-metrics-for-traces' into 'master'

Add documentation for Prometheus trace metrics

See merge request gitlab-org/gitlab!72104

doc/administration/monitoring/prometheus/gitlab_metrics.md

@@ -119,12 +119,15 @@ The following metrics are available:
 | `action_cable_pool_largest_size`                                 | Gauge       | 13.4    | Largest number of worker threads observed so far in ActionCable thread pool                                           | `server_mode`                                             |
 | `action_cable_pool_pending_tasks`                                | Gauge       | 13.4    | Number of tasks waiting to be executed in ActionCable thread pool                                                     | `server_mode`                                             |
 | `action_cable_pool_tasks_total`                                  | Gauge       | 13.4    | Total number of tasks executed in ActionCable thread pool                                                             | `server_mode`                                             |
+| `gitlab_ci_trace_operations_total`                               | Counter     | 13.4    | Total amount of different operations on a build trace                                                                 | `operation`                                               |
+| `gitlab_ci_trace_bytes_total`                                    | Counter     | 13.4    | Total amount of build trace bytes transferred                                                                         |                                                           |
 | `action_cable_single_client_transmissions_total`                 | Counter     | 13.10   | The number of ActionCable messages transmitted to any client in any channel                                           | `server_mode`                                             |
 | `action_cable_subscription_confirmations_total`                  | Counter     | 13.10   | The number of ActionCable subscriptions from clients confirmed                                                        | `server_mode`                                             |
 | `action_cable_subscription_rejections_total`                     | Counter     | 13.10   | The number of ActionCable subscriptions from clients rejected                                                         | `server_mode`                                             |
 | `action_cable_transmitted_bytes`                                 | Histogram   | 14.1    | Message size, in bytes, transmitted over action cable                                                                 | `operation`, `channel`                                    |
 | `gitlab_issuable_fast_count_by_state_total`                      | Counter     | 13.5    | Total number of row count operations on issue/merge request list pages                                                |                                                           |
 | `gitlab_issuable_fast_count_by_state_failures_total`             | Counter     | 13.5    | Number of soft-failed row count operations on issue/merge request list pages                                          |                                                           |
+| `gitlab_ci_trace_finalize_duration_seconds`                      | Histogram   | 13.6    | Duration of build trace chunks migration to object storage                                                            |                                                           |
 | `gitlab_external_http_total`                                     | Counter     | 13.8    | Total number of HTTP calls to external systems                                                                        | `controller`, `action`                                    |
 | `gitlab_external_http_duration_seconds`                          | Counter     | 13.8    | Duration in seconds spent on each HTTP call to external systems                                                       |                                                           |
 | `gitlab_external_http_exception_total`                           | Counter     | 13.8    | Total number of exceptions raised when making external HTTP calls                                                     |                                                           |