diff --git a/README.md b/README.md
index cd59b28..d53c2d4 100644
--- a/README.md
+++ b/README.md
@@ -169,9 +169,11 @@ TDP can either be deployed with the manager or directly with Ansible.
     Initialize the database and create the `tdp_vars` directory with the `tdp_vars_overrides` variables:
 
     ```sh
-    tdp init --overrides tdp_vars_overrides
+    tdp init --conf tdp_vars_overrides
     ```
 
+    **Note**: older versions of TDP-Lib have the option `--overrides` instead of `--conf`
+
     Make the DAG of operations:
 
     ```sh
@@ -278,10 +280,10 @@ py.test tests
 Run the tests in parallel:
 
 ```sh
-py.test -n 2 tests
+py.test tests
 ```
 
-**Note:** Running the tests in parallel requires more resources and tests might fail if resources are not sufficient.
+**Note:** If you want to run tests in parallel you may add the option `-n=2` for example. However, running the tests in parallel requires more resources and tests might fail if resources are not sufficient.
 
 ## Web UI links
 
diff --git a/inventory/group_vars/all.yml b/inventory/group_vars/all.yml
index ba94833..c2ce10a 100644
--- a/inventory/group_vars/all.yml
+++ b/inventory/group_vars/all.yml
@@ -100,31 +100,6 @@ ranger_policies:
           - { isAllowed: true, type: create }
         conditions: []
 
-  # Kafka
-  - name: tdp_user - topic
-    description: test_user access to tdp-user-* topics
-    service: kafka-tdp
-    isAuditEnabled: true
-    isEnabled: true
-    resources:
-      topic:
-        isExcludes: false
-        values: ["tdp-user-*"]
-    policyItems:
-      - users: [tdp_user]
-        groups: []
-        delegateAdmin: true
-        accesses:
-          - { isAllowed: true, type: create }
-          - { isAllowed: true, type: publish }
-          - { isAllowed: true, type: consume }
-          - { isAllowed: true, type: configure }
-          - { isAllowed: true, type: describe }
-          - { isAllowed: true, type: delete }
-          - { isAllowed: true, type: describe_configs }
-          - { isAllowed: true, type: alter_configs }
-        conditions: []
-
   # Knox
   - name: tdp_user - tdpldap policy
     description: tdp_user access to tdpldap policy
diff --git a/inventory/topologies/observability b/inventory/topologies/observability
index cf61ee4..f7eae4b 120000
--- a/inventory/topologies/observability
+++ b/inventory/topologies/observability
@@ -1 +1 @@
-../../ansible_collections/tosit/tdp_observability/topology.ini
\ No newline at end of file
+../../ansible_collections/tosit/tdp_observability/topology-light.ini
\ No newline at end of file
diff --git a/tdp_vars_overrides/kafka/kafka.yml b/tdp_vars_overrides/kafka/kafka.yml
deleted file mode 100644
index 5d3806e..0000000
--- a/tdp_vars_overrides/kafka/kafka.yml
+++ /dev/null
@@ -1,4 +0,0 @@
----
-kafka_start_on_boot: yes
-
-kafka_restart: always
diff --git a/tdp_vars_overrides/livy-spark3/livy-spark3.yml b/tdp_vars_overrides/livy-spark3/livy-spark3.yml
index 9e1935a..1e3b32a 100644
--- a/tdp_vars_overrides/livy-spark3/livy-spark3.yml
+++ b/tdp_vars_overrides/livy-spark3/livy-spark3.yml
@@ -1,5 +1,4 @@
 ---
-livy_release: apache-livy-0.8.0-incubating-TDP-0.1.0-SNAPSHOT-bin
 livy_start_on_boot: yes
 
 livy_restart: always
diff --git a/tdp_vars_overrides/livy/livy.yml b/tdp_vars_overrides/livy/livy.yml
deleted file mode 100644
index 9e1935a..0000000
--- a/tdp_vars_overrides/livy/livy.yml
+++ /dev/null
@@ -1,5 +0,0 @@
----
-livy_release: apache-livy-0.8.0-incubating-TDP-0.1.0-SNAPSHOT-bin
-livy_start_on_boot: yes
-
-livy_restart: always
diff --git a/tdp_vars_overrides/spark/spark.yml b/tdp_vars_overrides/spark/spark.yml
deleted file mode 100644
index 0e35859..0000000
--- a/tdp_vars_overrides/spark/spark.yml
+++ /dev/null
@@ -1,5 +0,0 @@
----
-spark_hs_start_on_boot: yes
-
-spark_hs_restart: always
-spark2_hs_heapsize: 512m
diff --git a/tdp_vars_overrides/zookeeper-kafka/zookeeper-kafka.yml b/tdp_vars_overrides/zookeeper-kafka/zookeeper-kafka.yml
deleted file mode 100644
index 229d9d1..0000000
--- a/tdp_vars_overrides/zookeeper-kafka/zookeeper-kafka.yml
+++ /dev/null
@@ -1,4 +0,0 @@
----
-zk_start_on_boot: yes
-
-zk_restart: always