SessLogs = log files of PowerCenter sessions; PowerCenter is the tool to perform masking tasks, sessions are individual load processes within workflows (process chains).
WorkflowLogs = log files of PowerCenter workflows (process chains); a workflow can consist of one or more sessions (I don't know how TDM 10.4.1 handles this topic, but probably at least one session is always contained within a workflow).
jobLogs = logs of IDQ (Informatica Data Quality) jobs; these probably often are profiling jobs for data analysis. The results of this data analysis are the data domains of the various attributes in source databases / files.
log_<n>.log = (if memory serves me right) log files of the so-called Service Manager of the software installation. Each installation is called a "node" within the Informatica domain, and the log files of each such node are stored within these directories.
Again, if memory serves me right.
tdm.log = probably (if memory serves me right) the log file of the TDM software itself; this software is used (via the web UI) to analyse data, to define and assign masking rules, to define, execute, and monitor masking and subset plans; and to maintain the test data warehouse(s).
Serialised workflows: no idea, it's too long ago since I've worked with the software for the last time.
Could please anyone from Informatica (or some other knowledgeable person) respond to this question, at least to those parts which I was not able to answer? That would be helpful.
Thanks in advance,