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An Introduction to Integrating Partner Applications with VPO
Integration Facilities Provided by VPO
Chapter 1 55
Threshold Monitoring
The preceding sections described the integration of events of which VPO
could read some type of text, for example, text written to a logfile or
associated with an SNMP trap. In addition, VPO provides a threshold
monitoring capability to deal with numeric object properties, for
example, resource allocation values such as CPU load, disk space usage,
or any other value relevant to the managed objects.
The importance of not generating too many messages has already been
stated; this also applies to numeric values. A first step towards reducing
the number of generated messages is to recalculate the monitored values
only at regular time intervals. These time intervals are user-defined and
can be different for each monitored value. In general, however, it is not
desirable to have a message generated every time the monitored value is
recalculated. To prevent this, VPO uses thresholds so that a message is
only generated when the monitored value exceeds a threshold.
Note that monitor values are not only obtained by the intelligent agent
recalculating the monitor value, they can also be passed to VPO agents
directly. The functions of the Agent Monitor API allow other applications
to pass monitor values to a VPO intelligent agent.
You can monitor any object property that can be expressed numerically,
including:
❏ Application and system values
Compare important application or system-specific values with their
expected “normal” values.
❏ Database values
Use the database SQL language and database administration tools to
monitor specific values, for example, table sizes, number of locks, etc.,
and compare these values with a predefined set of normal values.
❏ Processes
Use scripts to monitor whether important processes like daemons are
running. Check the important process specific values, for example,
the number of running processes.
❏ Files and/or Filesystems
Check the existence and/or the sizes of important files or file systems.
The script might return the used or available disk space and VPO
checks it against predefined upper or lower limits.