lib/resources/Alert.js
function (data, config, cb) {
            if (data.tags === undefined) {
                return new Error("tags param can not be empty.");
            }
            api.delete(this.baseURL + 'tags', data, config, cb);
        }
function (data, config, cb) {
            if (data.tags === undefined) {
                return new Error("tags param can not be empty.");
            }
            api.delete(this.baseURL + 'tags', data, config, cb);
        }
Remove tags request is used to remove tags from alerts in OpsGenie
One of id or alias parameters should be specified with add tags request. Alias option can only be used for open alerts
Also, tags param is mandatory as "tags": "emergency, delay"

@deprecated