diff --git a/.gitmodules b/.gitmodules
index 78dded1f13bdaed2671463dacb7eddae2fdd4701..413e7da87cf2b7bb1e3a9d966de26195af6c17bf 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,9 +1,6 @@
 [submodule "AAI"]
 	path = subprojects/AAI
 	url = ../helmholtz-aai.git
-[submodule "subprojects/HZDR-Gitlab-Mattermost"]
-	path = subprojects/HZDR-Gitlab-Mattermost
-	url = ../../../../fwcc-management/gitlab-statistics.git
 [submodule "subprojects/helmholtz-backbone-vpn"]
 	path = subprojects/helmholtz-backbone-vpn
 	url = ../helmholtz-backbone-vpn.git
diff --git a/data/hzdr_gitlab_users_daily/data.csv b/data/hzdr_gitlab_users_daily/data.csv
deleted file mode 120000
index 1923541b051400a3ecbb97fb2d6be7818c00e6a1..0000000000000000000000000000000000000000
--- a/data/hzdr_gitlab_users_daily/data.csv
+++ /dev/null
@@ -1 +0,0 @@
-../../subprojects/HZDR-Gitlab-Mattermost/stats/active_users.csv
\ No newline at end of file
diff --git a/data/hzdr_mattermost_daily/data.csv b/data/hzdr_mattermost_daily/data.csv
deleted file mode 120000
index da74b5363cb0d40d9beea72605ccbb1df386b688..0000000000000000000000000000000000000000
--- a/data/hzdr_mattermost_daily/data.csv
+++ /dev/null
@@ -1 +0,0 @@
-../../subprojects/HZDR-Gitlab-Mattermost/stats/mattermost_statistics.csv
\ No newline at end of file
diff --git a/gallery/gallery.md b/gallery/gallery.md
index 1219b1c0a0fa48e7533f8078d7bc2bc6007628e1..db4f3b92f6b0c166a52d8e9e4f8ab53afb239ea0 100644
--- a/gallery/gallery.md
+++ b/gallery/gallery.md
@@ -212,39 +212,9 @@
 ##### hzdr_codebase_project_statistics-plot_9.svg
 ![hzdr_codebase_project_statistics-plot_9.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_codebase_project_statistics-plot_9.svg?job=plot_general)
 
-##### hzdr_gitlab_users_daily-plot_2.svg
-![hzdr_gitlab_users_daily-plot_2.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_gitlab_users_daily-plot_2.svg?job=plot_general)
-
-##### hzdr_gitlab_users_daily-plot_3.svg
-![hzdr_gitlab_users_daily-plot_3.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_gitlab_users_daily-plot_3.svg?job=plot_general)
-
-##### hzdr_gitlab_users_daily-plot_4.svg
-![hzdr_gitlab_users_daily-plot_4.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_gitlab_users_daily-plot_4.svg?job=plot_general)
-
-##### hzdr_gitlab_users_daily-plot_5.svg
-![hzdr_gitlab_users_daily-plot_5.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_gitlab_users_daily-plot_5.svg?job=plot_general)
-
-##### hzdr_gitlab_users_daily-plot_6.svg
-![hzdr_gitlab_users_daily-plot_6.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_gitlab_users_daily-plot_6.svg?job=plot_general)
-
-##### hzdr_gitlab_users_daily-plot_7.svg
-![hzdr_gitlab_users_daily-plot_7.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_gitlab_users_daily-plot_7.svg?job=plot_general)
-
 ##### hzdr_helpdesk-plot_2.svg
 ![hzdr_helpdesk-plot_2.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_helpdesk-plot_2.svg?job=plot_general)
 
-##### hzdr_mattermost_daily-plot_2.svg
-![hzdr_mattermost_daily-plot_2.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_mattermost_daily-plot_2.svg?job=plot_general)
-
-##### hzdr_mattermost_daily-plot_3.svg
-![hzdr_mattermost_daily-plot_3.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_mattermost_daily-plot_3.svg?job=plot_general)
-
-##### hzdr_mattermost_daily-plot_4.svg
-![hzdr_mattermost_daily-plot_4.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_mattermost_daily-plot_4.svg?job=plot_general)
-
-##### hzdr_mattermost_daily-plot_5.svg
-![hzdr_mattermost_daily-plot_5.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_mattermost_daily-plot_5.svg?job=plot_general)
-
 ##### hzdr_mattermost-plot_2.svg
 ![hzdr_mattermost-plot_2.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_mattermost-plot_2.svg?job=plot_general)
 
diff --git a/subprojects/DESY-notes b/subprojects/DESY-notes
index 178099198b1575525921f809482ce44c83a4ab6b..b0b159597a98f32c59241a5163774901229acb2e 160000
--- a/subprojects/DESY-notes
+++ b/subprojects/DESY-notes
@@ -1 +1 @@
-Subproject commit 178099198b1575525921f809482ce44c83a4ab6b
+Subproject commit b0b159597a98f32c59241a5163774901229acb2e
diff --git a/subprojects/HZDR-Gitlab-Mattermost b/subprojects/HZDR-Gitlab-Mattermost
deleted file mode 160000
index c8a5bf4c05b7aa326c4ebe29ddebbae3d85ab4b1..0000000000000000000000000000000000000000
--- a/subprojects/HZDR-Gitlab-Mattermost
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit c8a5bf4c05b7aa326c4ebe29ddebbae3d85ab4b1