docs: Add release notes for 2.21.0 (#7140)

Co-authored-by: robot-ci-heartex <[email protected]>
Co-authored-by: caitlinwheeless <[email protected]>

docs/source/guide/release_notes/onprem/2.21.0.md

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+
+## Label Studio Enterprise 2.21.0
+
+<div class="onprem-highlight">Bulk labeling, enable AI features, and multiple labeling and Data Manager enhancements</div>
+
+*Feb 25, 2025*
+
+Helm Chart version: 1.9.5
+
+
+### New features
+
+#### Bulk labeling and image preview 
+
+There is a new **Bulk label** action available from the Data Manager. You can use this to quickly label tasks multiple tasks at once.
+
+This feature also includes enhancements to the Grid View in the Data Manager. Now when viewing images, you can zoom in/out, scroll, and pan.
+
+For more information, see the [Bulk labeling documentation](labeling#Bulk-labeling) and [Bulk Labeling: How to Classify in Batches](https://humansignal.com/blog/bulk-labeling-how-to-classify-in-batches/).
+
+![Screenshot of bulk label action](/images/releases/2-21-bulk-label.png)
+
+![Screenshot of Grid View preview](/images/releases/2-21-data-preview.png)
+
+#### Enable AI features
+
+There is a new toggle on the **Billing & Usage** page (only available to users in the Owner role). You can use this to enable [AI features](ask_ai) throughout Label Studio. 
+
+![Screenshot of enable AI](/images/releases/2-21-ai-enable.png)
+
+![Screenshot of AI banner](/images/releases/2-21-ai.png)
+
+
+### Enhancements
+
+#### Updated Billing & Usage page
+
+The **Billing & Usage** page (only accessible to users in the Owner role) has several new options:
+
+- **Early Adopter** - Opt in to new features before they're generally available.
+- **Enable AI Features** - Enables AI helper tools within Label Studio. See [AI features](ask_ai).
+- **White labeling** - Contact sales about enabling white labeling.
+- **Custom Scripts** - Contact sales to enable custom scripts. See [Custom scripts for projects](scripts).
+
+#### Updated template images
+
+The thumbnail images for the pre-built templates have been redesigned.
+
+![Screenshot of template library](/images/releases/2-21-templates.png)
+
+#### Clearer description of annotation count
+
+The annotation counter at the bottom of the Data Manager has been updated to read "Submitted Annotations." It previously read "Annotations," which could cause confusion.
+
+![Screenshot of counter](/images/releases/2-21-count.png)
+
+#### Display the prediction score in the labeling interface
+
+When you have annotations generated by predictions (pre-annotations), you will now see the prediction score (also known as the "confidence score") under the model name in the labeling interface tabs.
+
+![Screenshot of scores](/images/releases/2-21-score.png)
+
+#### Region number in Relations panel
+
+The **Relations** panel now displays the number identifier for the region when viewing relations between regions.
+
+![Screenshot of region IDs](/images/releases/2-21-regions.png)
+
+#### Export images with YOLO, YOLO_OBB, and COCO
+
+Previously, when exporting data in YOLO, YOLO_OBB, or COCO format, the images themselves were not included in the export. 
+
+To improve this, we have introduced three new choices to the export options:
+
+* **YOLO_WITH_IMAGES**
+
+* **YOLO_OBB_WITH_IMAGES**
+
+* **COCO_WITH_IMAGES**
+
+#### Set ground truths by user
+
+There is a new action from the Data Manager that allows you to mark the annotations submitted by a specific user as ground truth annotations.  
+
+![Screenshot of ground truths](/images/releases/2-21-gt.png)
+
+![Screenshot of ground truths](/images/releases/2-21-gt2.png)
+
+#### Control login redirects
+
+There is a new `LOGIN_PAGE_URL` variable will redirect the login page to the URL specified in the variable. This is useful for organizations with that have white labeling enabled and/or multiple internal groups that have different IdP provider logins (or no IdP provider login).   
+
+#### Performance improvements
+
+Various performance improvements around Members page load time, annotation creation, and memory usage for Image tags. 
+
+### Security
+
+- Updated Iodash to address security vulnerabilities.
+
+- Ensured that file paths remain hidden when import operations fail.
+
+### Bug fixes
+
+- Fixed an issue where the Annotator Performance drop-down was not filtering the results as expected.
+
+- Fixed an issue where users were unable to select and move bounding box regions after adding brush regions.
+
+- Fixed an issue where seeking within a video would display duplicate frames in the the Video tag.
+
+- Fixed an issue when managers could review skipped tasks in Quick View.
+
+- Fixed an issue where project to groups mapping was not working correctly for SAML.
+
+- Fixed an issue that caused would sometimes cause project creation to fail when pasting code into the code editor.
+
+- Fixed an issue where Sentry would still attempt to load assets even if disabled.
+
+### Feature flag updates
+
+The following feature flags have been marked stale or deleted, meaning they can no longer be turned on or off by users:
+
+`fflag_feat_front_optic_767_annotator_project_multiselect_short`  
+`fflag_fix_back_leap_612_explore_review_09042024_short`  
+`fflag_fix_optic_214_extra_blank_dashboard_charts_short`  
+`fflag_fix_optic_391_tasks_outside_low_agreement_project_counts_short`  
+`fflag_fix_all_leap_877_annotator_membership_api_03042024_short`  
+`fflag_feat_all_optic_520_annotator_report_short`  
+`feat_all_optic_71_dashboard_multiple_labeling_group_support_v1_01092023_short`  
+`fflag_feat_front_prod_281_project_list_search_19072023_short`  
+`fflag_feat_all_lsdv_e_295_project_level_roles_via_saml_scim_ldap_short`  
+`ff_back_2884_comments_notifications_02092022_short`  
+`ff_back_DEV_1711_review_queue_140222_short`  
+`ff_front_dev_1480_created_on_in_review_180122_short`  
+`fflag_fix_front_leap_32_zoom_perf_190923_short`  
+`fflag_feat_front_lsdv_5452_taxonomy_labeling_110823_short`  
+`fflag_fix_front_dev_3793_relative_coords_short`  
+`ff_front_dev_2715_audio_3_280722_short`  
+`fflag_feat_front_optic_1351_use_new_projects_counts_api_short`  
+`fflag_feature_all_optic_1421_cold_start_v2`  
+`fflag_fix_back_optic_1407_optimize_tasks_api_pagination_counts`  
+`fflag_fix_optic_1259_lse_projects_read_apis_use_replica_short`  
+`fflag_feat_all_optic_1181_membership_performance`  
+`fflag_feat_optic_1025_zendesk_widget_integration`  
+`fflag_feat_all_optic_991_dashboard_v2_short`  
+`fflag_feat_optic_378_limit_projects_per_page_to_ten_short`  
+`fflag_feat_optic_67_drag_and_drop_charts`