stucking jobs

We have trouble with some jobs - they stuck an fill up the queue. We have nearly 8000 jobs in our sidekiq queue

stucking jobs:

Warteschlange	                      Größe		Latency	Aktionen
cronjob:ci_archive_traces_cron	        15		52,220.85 (vor 14 Stunden)	
cronjob:expire_build_artifacts	        15		53,840.02 (vor 14 Stunden)	
cronjob:geo_sidekiq_cron_config	        3,166		190,098.19 (vor 2 Tagen)	
cronjob:import_export_project_cleanup	18		67,648.42 (vor 18 Stunden)	
cronjob:ldap_all_groups_sync	        13		49,630.77 (vor 13 Stunden)	
cronjob:pages_domain_verification_cron	173		155,862.71 (vor 1 Tag)	
cronjob:pipeline_schedule	        24		83,195.92 (vor 23 Stunden)	
cronjob:prune_web_hook_logs	        11		42,448.32 (vor 11 Stunden)	
cronjob:repository_archive_cache	21		78,460.51 (vor 21 Stunden)	
cronjob:repository_check_dispatch	17		59,240.54 (vor 16 Stunden)	
cronjob:schedule_migrate_external_diffs	23		81,143.66 (vor 22 Stunden)	
cronjob:stuck_import_jobs	        8		27,135.46 (vor 7 Stunden)	
cronjob:stuck_merge_jobs	        1		6,445.12 (vor 1 Stunde)	
cronjob:update_all_mirrors	        3,175		190,642.64 (vor 2 Tagen)	
merge	                                1		4,679.93 (vor 1 Stunde)	
pipeline_background:archive_trace	75		13,506.33 (vor 3 Stunden)	
pipeline_cache:expire_job_cache	        272		13,520.95 (vor 3 Stunden)	
pipeline_cache:expire_pipeline_cache	33		12,762.6 (vor 3 Stunden)	
pipeline_hooks:build_hooks	        329		13,544.56 (vor 3 Stunden)	
pipeline_hooks:pipeline_hooks	        59		13,446.26 (vor 3 Stunden)	
pipeline_processing:pipeline_process	28		8,755.41 (vor 2 Stunden)	
pipeline_processing:pipeline_update	11		8,732.15 (vor 2 Stunden)	
pipeline_processing:stage_update	211		13,488.51 (vor 3 Stunden)	
project_cache                   	14		13,524.68 (vor 3 Stunden)	
project_daily_statistics	        54		13,329.45 (vor 3 Stunden)	
reactive_caching	                7		8,265.95 (vor 2 Stunden)	
rebase                           	158		175,677.91 (vor 2 Tagen)	
update_project_statistics	        7		7,869.8 (vor 2 Stunden)	

sidekiq

Here is a screenshot from background jobs - i have allready increased the sidkiq worker, but they are all busy.backround-jobs

Errors in production log.

production.log:Creating scope :failed. Overwriting existing method Ci::Stage.failed.
production.log:Creating scope :failed. Overwriting existing method Geo::FileRegistry.failed.

and that the rebase fails shows up but I can't find anything else. gitlab-rake gitlab:check - no errors

Best Regards, Nicole!