diff --git a/roles/blackbox_exporter/meta/argument_specs.yml b/roles/blackbox_exporter/meta/argument_specs.yml
index 5848269a2..c5e735875 100644
--- a/roles/blackbox_exporter/meta/argument_specs.yml
+++ b/roles/blackbox_exporter/meta/argument_specs.yml
@@ -34,3 +34,9 @@ argument_specs:
             http:
               method: GET
               valid_status_codes: []
+      blackbox_exporter_user:
+        description: "The user the exporter runs as"
+        default: "blackbox-exp"
+      blackbox_exporter_group:
+        description: "The group the exporter runs as"
+        default: "blackbox-exp"
diff --git a/roles/mysqld_exporter/defaults/main.yml b/roles/mysqld_exporter/defaults/main.yml
index d85a41ab9..cd4637698 100644
--- a/roles/mysqld_exporter/defaults/main.yml
+++ b/roles/mysqld_exporter/defaults/main.yml
@@ -13,8 +13,8 @@ mysqld_exporter_username: exporter
 mysqld_exporter_password: secret
 
 mysqld_exporter_config_file: "mysqld_exporter.cnf"
-# mysqld_exporter_host: localhost
-# mysqld_exporter_port: 3306
+mysqld_exporter_host: null
+mysqld_exporter_port: null
 mysqld_exporter_socket: "/run/mysqld/mysqld.sock"
 
 mysqld_exporter_tls_server_config: {}
diff --git a/roles/mysqld_exporter/meta/argument_specs.yml b/roles/mysqld_exporter/meta/argument_specs.yml
index 77abafa41..6dfac06d2 100644
--- a/roles/mysqld_exporter/meta/argument_specs.yml
+++ b/roles/mysqld_exporter/meta/argument_specs.yml
@@ -32,6 +32,9 @@ argument_specs:
       mysqld_exporter_web_telemetry_path:
         description: "Path under which to expose metrics"
         default: "/metrics"
+      mysqld_exporter_config_dir:
+        description: "The path where exporter configuration is stored"
+        default: "/etc/mysqld_exporter"
       mysqld_exporter_config_file:
         description: "The filename of the exporter mysql config file"
         default: "mysqld_exporter.cnf"
@@ -42,6 +45,12 @@ argument_specs:
       mysqld_exporter_socket:
         description: "The target MySQL unix socket"
         default: "/run/mysqld/mysqld.sock"
+      mysqld_exporter_username:
+        description: "The username for MySQL login"
+        default: "exporter"
+      mysqld_exporter_password:
+        description: "The password for MySQL login"
+        default: "secret"
       mysqld_exporter_enabled_collectors:
         description:
           - "List of dicts defining additionally enabled collectors and their configuration."