Temporal worker debug logs contain "NewTimer" and "ExecuteActivity" records


I noticed that logs from my temporal worker binary contain debug level entries with messages “NewTimer” and “ExecuteActivity”. I do not log that explicitly.

“NewTimer” seems to be logged on workflow.Sleep and workflow.NewTimer calls.
“ExecuteActivity” is called for one particular activity but not for others for some reason.

I could solve this by raising logs level to “Info” or above. But still would like to find out why these messages are logged and if there is a possibility to disable them?