Checking the screenshots, I saw that your instance's disk is almost full. I think this can be the problem you are running into now or a problem in the future, can you increase that disk?
Apart from that, I also found this line in the Tomcat's log
20-Sep-2019 11:24:24.384 SEVERE [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [jenkins] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@3f7a598d]) and a value of type [org.acegisecurity.context.SecurityContextImpl] (value [org.acegisecurity.context.SecurityContextImpl@ffffffff: Null authentication]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
This is probably because your application requires more memory that the one it currently has. I'd try increasing the instance type to know if that solves the issue.
Happy to help!
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