SonarQube logs getting lost

SonarQube 7.9.1 Enterprise LTS

I have noticed that some of the logs are getting lost. Here is the screenshot from logs directory, notice that web.log is missing for 27th July, while the latest web.log has entries starting only from 28th July.

Log properties are all same as default, no custom rolling policy has been defined.

What’s the reason for missing web logs ?