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A compression policy contains a rule, which is a logical expression that enables the Citrix ADC appliance to identify the traffic that should be compressed.

When the Citrix ADC receives an HTTP response from a server, it evaluates the built-in compression policies and any custom compression policies to determine whether to compress the response and, if so, the type of compression to apply. Priorities assigned to the policies determine the order in which the policies are matched against the requests.

Using the CtxNsCmpPolicyTest, administrators can quickly identify the compression policies that have been configured and the count of responses that match each policy. This helps administrators measure the effectiveness of compression policies and isolate those policies that are most and least effectively. Additionally, the test alerts administrators if any policy could not be evaluated, resulting in an undefined event. This way, the test turns the spotlight on policies that may be incorrectly configured.

Outputs of the test: One set of results for each policy configured on the Citrix ADC VPX/MPX appliance being monitored.

Measurement

Description

Measurement Unit

Interpretation

Hits

Indicates the count of responses that matched this policy during the last measurement period.

Number

Compare the value of this measure across policy to know which policy label was applied to the maximum number of responses.

If this value is abnormally high for any policy, you may want to review the policy to verify if it has been correctly configured.

Undef_hits

Indicates the count of requests for which this policy triggered an undefined event during the last measurement period.

Number

An undefined event is triggered when the NetScaler cannot evaluate a policy, usually because it detects a logical or other error in the policy or an error condition on the NetScaler.

Ideally, the value of this measure should be 0.