Reference Guide

Rule Types
Zend Server Reference Manual
The events listed in Monitor | Events are based on rules defined in Rule Management | Monitoring, If a
rule is enabled, it is displayed in the Events page when it is triggered. When more than one event with a
high percentage of similarity is triggered, it is aggregated into a single report. These reports are called
issues.
The following list displays the possible rule types that can generate issues in the Events page:
Function Error - A Function Error rule provides specific information about the root cause of an
error that may not be related to a PHP error. QA and production teams can use this event rule
type to identify run-time events, as opposed to PHP errors, which identify code-related/syntactical
events. Severity: Warning.
Database Error - A Database Error rule provides specific information about the root cause of an
error that may not be related to a PHP error. QA and production teams can use this event rule
type to identify database connectivity and query events, as opposed to PHP errors, which identify
code-related/syntactical events. Severity: Warning.
Slow Function Execution - Slow Function Execution rules identify bottlenecks within functions,
providing a more granular approach than finding bottlenecks in pages. This type of event rule is
particularly useful in the production process, because it can pinpoint performance bottlenecks for
user-specific functions, as well as the predefined list of functions that are considered prone to
slow execution. Severity: Warning and Critical.
Slow Query Execution - Slow Query Execution rules generate an event when database related
function execution rises above the given threshold. Slow Query Execution events identify slow
queries that are related to database performance that can directly influence Web server
performance.
Slow Request Execution - Slow Request Execution rules generate an event when script
execution time exceeds defined limits. These event rules are used to maintain script runtime
performance standards. The settings can be relative to a specified percentage or set to an
absolute value. Severity: Warning and Critical.
High Memory Usage - Memory Usage event rules identify when scripts use excess memory
resources that can, in turn, reduce the application's performance. This type of rule is primarily
used in production environments, but QA teams can also benefit from monitoring by kilobyte (KB)
or by the percentage of memory used by a script to execute. The settings can be relative to a
specified percentage or set to an absolute value. Severity: Warning and Critical.
Inconsistent Output Size - Inconsistent Output Size event rules verify that pages render the
same output to the client each time. If pages do not render the same output each time, this
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