BytemanHelper memory stress: add ability to define how much heap memory is used

[mkorosec]

Usage

RULE heap-99
CLASS org.chaos_mesh.chaos_agent.TriggerThread
METHOD triggerFunc
HELPER org.chaos_mesh.byteman.helper.StressHelper
AT ENTRY
IF true
DO
    injectLimitedMemStress("heap-99", "heap", "0.99");
ENDRULE

Some other examples for the usedHeap value that work: 50%, 100MB, 1GB, 0.5

How to test

Writting this down for anyone wanting to try this out before it's taken into the official release.

Simplest way is to locally rebuild the docker image used for the chaos-daemon and then use this new image in your k8s cluster.

Dockerfile

FROM ghcr.io/chaos-mesh/chaos-daemon:v2.7.1
COPY byteman-helper.jar /usr/local/byteman/lib/byteman-helper.jar

build the image locally

cd BytemanHelper
mvn clean package
cp target/byteman-helper*.jar {where you placed the Dockerfile}/byteman-helper.jar
cd {where you placed the Dockerfile}
docker build -t chaos-daemon:v2.7.1-byteman-helper .

use the locally built image in your k8s repo

kubectl patch daemonset chaos-daemon -n chaos-mesh -p '{"spec": {"template": {"spec":{"containers":[{"image":"chaos-daemon:v2.7.1-byteman-helper", "name": "chaos-daemon"}]}}}}'

[chaotic-prow]

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