private boolean isDockerEnv() {
        File file = new File(DOT_DOCKER_ENV_FILEPATH);
        return file.exists() || System.getenv(KUBERNETES_SERVICE_HOST) != null;
    }
Returns <tt>true</tt> if {@value #CONTAINER_PROPERTY_KEY} property exists and has no value or is <tt>true</tt>.

@return <tt>true</tt> if {@value #CONTAINER_PROPERTY_KEY} property exists and has no value or is <tt>true</tt>.
agent-module/profiler/src/main/java/com/navercorp/pinpoint/profiler/util/ContainerResolver.java