Rework screenshots

Author: DifferentialOrange

doc/monitoring/grafana_dashboard.rst

@@ -16,17 +16,14 @@ Dashboard requires using ``metrics`` **0.5.0** or newer;
 ``'alias'`` :ref:`global label <tarantool-metrics>` must be set on each instance
 to properly display panels (e.g. provided with ``cartridge.roles.metrics`` role).
 
-.. image:: images/prometheus_dashboard_1.png
- :width: 40%
+.. image:: images/Prometheus_dashboard_1.png
+ :width: 30%
 
-.. image:: images/prometheus_dashboard_2.png
- :width: 40%
+.. image:: images/Prometheus_dashboard_2.png
+ :width: 30%
 
-.. image:: images/prometheus_dashboard_3.png
- :width: 40%
-
-.. image:: images/prometheus_dashboard_4.png
- :width: 40%
+.. image:: images/Prometheus_dashboard_3.png
+ :width: 30%
 
 .. _monitoring-grafana_dashboard-monitoring_stack: