Cisco Systems and the ASA Services Module Manual De Usuario

 lists each feature change and the platform release in which it was implemented.

You can configure the ASA to collect extensive statistics. This section includes the following topics:

Advanced threat detection statistics show both allowed and dropped traffic rates for individual objects 
such as hosts, ports, protocols, or ACLs.

Enabling advanced statistics can affect the ASA performance, depending on the type of statistics 
enabled. The threat-detection statistics host command affects performance in a significant way; if you 
have a high traffic load, you might consider enabling this type of statistics temporarily. The 
threat-detection statistics port command, however, has modest impact.

This section includes the guidelines and limitations for this feature:

Basic threat detection statistics

8.0(2)

Basic threat detection statistics was introduced.

The following commands were introduced: 
threat-detection basic-threat, threat-detection rate, 
show threat-detection rate, clear threat-detection rate.

Burst rate interval changed to 1/30th of the 
average rate.

8.2(1)

In earlier releases, the burst rate interval was 1/60th of the 
average rate. To maximize memory usage, the sampling 
interval was reduced to 30 times during the average rate.

Improved memory usage

8.3(1)

The memory usage for threat detection was improved.