I set my site to be checked every 1 (10, 30 etc) minutes, however I see only 1 record in logs for a day. Why?

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Note that adjacent checks with the same result (all show Ok or all fail) stack into a single record in logs by default. Pay attention to columns "Check cnt." and "Interval" in the log. "Check cnt." shows how many checks have been made for the specified interval. It is done to make logs less bulky. However, you may turn on "Full log" option for your tasks - in this case all checks are saved separately. You may select this option while creating or editing a task.
Tags: monitoring