Not easily.
openhab.log is the combination of all sorts of loggers from different parts of OH so it’s easy to identify a specific logger (e.g. for a specific binding) and change its configuration to log somewhere.
events.log comes only comes from one logger, the event bus. You can’t just configure a new appender in log4j2.xml and tell it to log certain lines to another file.
So your choices are:
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Set of a REGEX filter on events.log to suppress the Items you don’t want to see and then configure a new appender and then configure a new appender and set of loggers with a REGEX filter to suppress everything except the Items you want to filter into another file.
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Suppress updates from all Items. By default, only changes are logged already.
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To limit the number of changes you see, you can use the round profile so the Item changes less often, assuming the Item represents a sensor that’s just a little noisy (e.g. temperature or humidity sensors).
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Leave it and use your existing tools to filter as you look at/watch the logs.
Personally, I think 1 is more work than it’s worth and will be a little bit brittle. There are several posts about. Here is another example: Log filtering in OH 3 - #22 by markus7017.
2 should already be your configuration unless you did not misspeak and you really do mean updates instead of changes.
3 is what I do for the few chatty Items I have. I don’t really want these filling up my persistence and triggering rules unnecessarily either so it’s win-win. I don’t really need to process a difference of 0.01 °F. For all purposes that’s the same reading.
4 is always what I recommend, see How to watch and look through logging