Interactive Reports for Java Systems - Availability 
Probably the most important metric for systems is their availability. You can use reports about availability to centrally display the availability of your monitored systems, instances, hosts, and databases. In the context of interactive reporting, there are four reports available to give you a quick overview of the development of these availability values over time:
System Availability (
<System ID> – SAP J2EE Engine <Release> 
Availability System Availability 
)The report displays the availability of the selected system. A system is available if the message server of the system answers an HTTP request, and at least one application server is active at the message server.
The report takes account of unavailability because of planned downtime (see also Managing Work Modes). System availability can take the following values:
Available
Not available during a planned downtime
Unplanned downtime
No availability information available. Availability undefined
Instance Availability (
<System ID> – SAP J2EE Engine <Release> Availability Instance Availability )The report outputs the availability of the instances of the selected system.
Host Availability (
<System ID> – SAP J2EE Engine <Release> Availability Host Availability )This report displays the availability of the hosts on which there are instances of the selected system. The availability is determined using an ICMP ping.
Database Availability (
<System ID> – SAP J2EE Engine <Release> Availability Database Availability )The report specifies the availability of the database.
Note
For information about how you can specify the desired systems and the time interval to be displayed, and how to call interactive reporting, see Using Interactive Reporting.
For information about the different display options for the reports for Java systems with regard to metrics, threshold values, and instances, see Interactive Reports for Java Systems.