public Builder clearTimestamp() {
            copyOnWrite();
            instance.clearTimestamp();
            return this;
        }
<pre>
Common =&gt; [1, 3]
</pre>

<code>int64 timestamp = 1;</code>

@return This builder for chaining.
turms-client-kotlin/src/main/java/im/turms/client/model/proto/notification/TurmsNotification.java