docs: update broken README link

README.md

@@ -17,7 +17,7 @@ metrics or alerting.
 - [`grafana`](roles/grafana/README.md): a popular visualization and
   dashboard creation tool able to use various datasources.
 
-- [`matrix-alertmanager`](roles/matrix-alertmanager/README.md): An alert-
+- [`matrix_alertmanager`](roles/matrix_alertmanager/README.md): An alert-
   manager receiver which posts alerts to a configured matrix channel
   using alertmanagers' webhooks.
 

roles/grafana/meta/main.yml

@@ -0,0 +1,11 @@
+---
+allow_duplicates: true
+dependencies: []
+galaxy_info:
+  role_name: grafana
+  description: Deploy and configure the grafana
+  galaxy_tags:
+    - grafana
+    - monitoring
+    - prometheus
+    - docker

roles/matrix_alertmanager/meta/main.yml

@@ -0,0 +1,12 @@
+---
+allow_duplicates: true
+dependencies: []
+galaxy_info:
+  role_name: matrix_alertmanager
+  description: Deploy matrix_alertmanager, an alertmanager receiver for matrix rooms
+  galaxy_tags:
+    - matrix_alertmanager
+    - alertmanager_receiver
+    - alertmanager
+    - matrix
+    - docker

roles/postgres_exporter/meta/main.yml

@@ -0,0 +1,12 @@
+---
+allow_duplicates: true
+dependencies: []
+galaxy_info:
+  role_name: postgres_exporter
+  description: Deploy and configure the prometheus-maintained postgres_exporter
+  galaxy_tags:
+    - postgres_exporter
+    - prometheus
+    - postgresql
+    - postgres
+    - docker

roles/vmalert/meta/main.yml

@@ -0,0 +1,11 @@
+---
+allow_duplicates: true
+dependencies: []
+galaxy_info:
+  role_name: vmalert
+  description: Deploy and configure the victoriametrics alerting engine `vmalert`
+  galaxy_tags:
+    - victoriametrics
+    - vmalert
+    - alerting
+    - prometheus

roles/vmtsdb/meta/main.yml

@@ -0,0 +1,10 @@
+---
+allow_duplicates: true
+dependencies: []
+galaxy_info:
+  role_name: vmtsdb
+  description: Deploy and configure the victoriametrics time-series database `vmtsdb`
+  galaxy_tags:
+    - victoriametrics
+    - vmtsdb
+    - prometheus