What is Diagsnap in Oracle 12c Diagsnap is a new feature introduced in 12.1.0.2 GI, which manages the diagsnap resource, which collects additional operating system statistics that are not normally collected by CHM (Cluster Health Monitor) osysmod. Diagsnap metric collection automatically runs every 15 minutes to collect baseline metrics. Which events trigger Diagsnap? if cssd process reports mis..