private Map<String, Object> buildContent(JsonObject jsonObject) {
        final var content = new HashMap<String, Object>();
        content.put("msg_type", jsonObject.get("msg_type").getAsString());
        if (jsonObject.get("ats") != null) {
            final var ats = jsonObject.get("ats").getAsString();
            final var collect = Arrays.stream(ats.split(",")).map(String::trim).collect(Collectors.toList());
            var text = jsonObject.get("content").getAsJsonObject().get("text").getAsString();
            for (final var userId : collect) {
                text += "<at user_id=\"" + userId + "\"></at>";
            }
            jsonObject.get("content").getAsJsonObject().addProperty("text", text);
        }
        content.put("content", jsonObject.get("content").getAsJsonObject());
        return content;
    }
build content,if it has ats someone set the ats
oap-server/server-alarm-plugin/src/main/java/org/apache/skywalking/oap/server/core/alarm/provider/feishu/FeishuHookCallback.java