presto-main/src/main/java/io/prestosql/server/ClusterStatsResource.java/ClusterStatsResource/getWorkerMemoryInfo
class ClusterStatsResource:    @GET
    @Path("workerMemory")
    public Response getWorkerMemoryInfo()
    {
        return Response.ok()
                .entity(clusterMemoryManager.getWorkerMemoryInfo())
                .build();
    }