add monitoring text

Author: mariojmdavid

content/06.quality_criteria.md

@@ -180,6 +180,13 @@ Agreement (SLA) with user communities.
 
 ### Monitoring [SvcQC.Mon]
 
+Monitoring is a periodic testing of the **Service**. It requires a monitoring
+service from where tests are executed or sent and results of those tests are shown.
+The tests can be the same, in part or in total of the Functional tests.
+The technology used for the monitoring, is left to the developers of the underlying
+software to decide eventually with input from the infrastructure(s),
+where the **Service** is foreseen to be integrated.
+
 * **[SvcQC.Mon01]** The **Service** in an operational production state SHOULD be monitored.
   * **[SvcQC.Mon01.1]** The **Service** public endpoints SHOULD be monitored.
   * **[SvcQC.Mon01.2]** The **Service** public APIs SHOULD be monitored.