private String buildReportHeartbeatUrl(String baseUrl) {
        return baseUrl + conf.get(AGENT_MANAGER_HEARTBEAT_HTTP_PATH, DEFAULT_AGENT_MANAGER_HEARTBEAT_HTTP_PATH);
    }
build dead heartbeat message of agent
inlong-agent/agent-core/src/main/java/org/apache/inlong/agent/core/HeartbeatManager.java