As of now only the Notes session activity is being recorded in "Usage" views of log.nsf and it is very helpful in understanding the users accessing the databases and number of documents read/write in a session and the number of transactions performed as shown on attached screenshot.
However, for HTTP session activity, HTTP Activity Logging is the best so far we can do in Domino to log information such as the name of the Web server, the name of the user accessing the Web server, the HTTP request, the URL the user clicked, the number of bytes returned as a result of the request, the amount of time it took to process the request, the HTTP status code returned as a result of the request, and the time at which the request occurred.
https://help.hcltechsw.com/domino/11.0.1/admin/admn_httpactivitylogging_r.html
Inorder to check the number of documents read/write by any web user in a database, it is required to verify from database properties -> "User Details".
However, it is not possible to determine if the transactions are done by logging through web or from Notes client.
It would be very helpful for the administrator for analysis purposes if the HTTP session activity information such as the number of documents read/write by a user in a HTTP session as it is being recorded for Notes sessions in "Usage" view of log.nsf.
