DSL documentation generation failed - OutOfMemoryError

Hi folks!

I've just installed TeamCity on a DigitalOcean droplet (with 4GB of RAM + 8GB of swap) inside a docker container.

The whole thing just works, but after a restart, I see the CPU get stuck in 100% (with the memory usage never going above 2GB) until it ends up throwing this:

teamcity_1  | [2018-12-22 14:37:48,231]   WARN - r.configs.dsl.DslPluginManager - DSL documentation generation failed

teamcity_1  | exit code: 1

teamcity_1  | stderr: Picked up JAVA_TOOL_OPTIONS: -XX:+UnlockExperimentalVMOptions -XX:+UseCGroupMemoryLimitForHeap

teamcity_1  | Exception in thread "main" java.lang.OutOfMemoryError: Java heap space

It's erroring on a call similar to this one:

/opt/java/openjdk/jre/bin/java -Xmx512m -cp /opt/teamcity/webapps/ROOT/WEB-INF/plugins/.unpacked/configs-dsl/dokka/dokka-fatjar-0.9.15.jar org.jetbrains.dokka.MainKt -output /opt/teamcity/temp/dslPluginsDoc4096403338974359149dir -format html -packageOptions jetbrains.buildServer,-warnUndocumented -cacheRoot /opt/teamcity/temp/dokka2087736397715398231cache -include /opt/teamcity/temp/KotlinDSL2987884695142819176.md -links http://docs.oracle.com/javase/6/docs/api/^/opt/teamcity/webapps/ROOT/WEB-INF/plugins/.unpacked/configs-dsl/server/package-lists/java^^https://kotlinlang.org/api/latest/jvm/stdlib/^/opt/teamcity/webapps/ROOT/WEB-INF/plugins/.unpacked/configs-dsl/server/package-lists/kotlin /opt/teamcity/webapps/ROOT/WEB-INF/plugins/.unpacked/configs-dsl/server/configs-dsl-src /opt/teamcity/temp/genKotlin8629786587319887788dir 

and the issue seems to be that it's passing -Xmx512m... but I can't figure out where it's calling that or how to affect it (TEAMCITY_SERVER_MEM_OPTS doesn't make a difference)

Thanks!