DX APM - The SystemEDGE CPU metrics 'update interval' is hardcoded to 60 seconds.

Products

• CA Application Performance Management SaaS
• DX Application Performance Management

Issue/Introduction

Using Infrastructure agent hostmonitor extension, many of the values especially those under SystemEdge|<host>|CPU and SystemEdge|<host>|Memory but others as well have very saw tooth pattern dropping regularly to 0 which looks more like a sampling issue than a real oscillation in the values being measured.  For example :

Environment

Release : SAAS

Cause

The SystemEDGE metrics update interval is hardcoded to 60 seconds,, however, the APM Infrastructure agent gets all the ticks in one interval and therefore reports 0 for subsequent 3 intervals.

From SystemEDGE documentation: CPU Statistics Table 

 

CPU Statistics Table

The CPU Statistics table provides performance statistics for each CPU.

Class: cpuStatsEntry

Instance: value of cpuStatsDescr and cpuStatsIndex attributes for the specific CPU
Each table entry provides the latest statistics for one CPU. The agent periodically (every
60 seconds) checks the status of the system data structures for each CPU and records
the values in the table. Use the CPU Statistics table to monitor the following statistics:

• • CPU type (cpuStatsDesc)
  • Number of ticks spent in Idle, User, System, or Wait mode (cpuStatsIdle,cpuStatsUser, cpuStatsSys, cpuStatsWait)
  • Time of last statistics update (cpuStatsLastUpdate)
  • Percentage of the physical processors consumed by logical CPU (cpuStatsPC)
  • Percentage of entitled capacity consumed by logical CPU (cpuStatsEC)
  • Percentage of time in Idle, User, Sys, or Wait mode (cpuStatsIdlePercent,cpuStatsUserPercent, cpuStatsSysPercent, cpuStatsWaitPercent)

When you use the CPU statistics table, see the cpuStatsLastUpdate column for
information about the time (in TimeTicks) that this row was last updated. This column
provides information whether the statistics have been updated since you last queried
the table.

 

Resolution

Workaround: Use the 60 seconds resolution when viewing and creating alerts based on sysedge metrics

Solution: An Enhancement Request has been created to allow SysEdge to collect data more frequently

Additional Information

Host Monitor