Focus of Tracing
Activity Region pattern (Volume 4, page 348) highlights “mechanical” and syntactical aspects of trace analysis whereas this pattern brings attention to changing semantics of trace message flow, for example, in Citrix terminal services environment, from logon messages during session initialization to LHC database search. Here is a graphical illustration of the pattern where tracing focus region spans 3 regions of activity:
Event Sequence Order
In any system this pattern is expected as a precondition to its normal behavior. Any out-of-order events should raise the suspicion bar as they ...