add InfluxDB monitoring solution to zookeeperMonitor.md

describe InfluxDB monitoring solution

Author: Ivan Kudibal <8028110+ivankudibal@users.noreply.github.com>

Reviewers: maoling, hanm

Closes apache#1453 from ivankudibal/patch-1

zookeeper-docs/src/main/resources/markdown/zookeeperMonitor.md

@@ -20,6 +20,7 @@ limitations under the License.
     * [Metrics](#Metrics)
     * [Prometheus](#Prometheus)
     * [Grafana](#Grafana)
+    * [InfluxDB](#influxdb)
 
 * [JMX](#JMX)
 
@@ -86,6 +87,21 @@ All the metrics are included in the `ServerMetrics.java`.
 - Then download and import the default ZooKeeper dashboard [template](https://grafana.com/dashboards/10465) and customize.
 - Users can ask for Grafana dashboard account if having any good improvements by writing a email to **dev@zookeeper.apache.org**.
 
+<a name="influxdb"></a>
+
+### InfluxDB
+
+InfluxDB is an open source time series data that is often used to store metrics
+from Zookeeper. You can [download](https://portal.influxdata.com/downloads/) the
+open source version or create a [free](https://cloud2.influxdata.com/signup)
+account on InfluxDB Cloud. In either case, configure the [Apache Zookeeper
+Telegraf plugin](https://www.influxdata.com/integration/apache-zookeeper/) to
+start collecting and storing metrics from your Zookeeper clusters into your
+InfluxDB instance. There is also an [Apache Zookeeper InfluxDB
+template](https://www.influxdata.com/influxdb-templates/zookeeper-monitor/) that
+includes the Telegraf configurations and a dashboard to get you set up right
+away.
+
 <a name="JMX"></a>
 ## JMX
 More details can be found in [here](http://zookeeper.apache.org/doc/current/zookeeperJMX.html)