How to configure WSO2 EI 6.1.x Analytics with MongoDB event store - mongodb

Question

I tried to configure WSO2 EI Analytics 6.1.1u23 to use MongoDb as event store but without success.
I have found this PR to add MongoDb support for Analytics records;
I have added in analytics-datasources.xml this configuration:
<providers>
<provider>org.wso2.carbon.datasource.reader.mongo.MongoDataSourceReader</provider>
</providers>
<datasource>
<name>WSO2_ANALYTICS_DS_MONGO</name>
<description>The datasource used for analytics record store</description>
<definition type="MONGO">
<configuration>
<host>xxx.xxx.xxx.xxx</host>
<port>27017</port>
</configuration>
</definition>
</datasource>
And in analytics-config.xml this configuration:
<analytics-record-store name="EVENT_STORE">
<implementation>org.wso2.carbon.analytics.datasource.mongo.MongoAnalyticsRecordStore</implementation>
<properties>
<property name="datasource">WSO2_ANALYTICS_DS_MONGO</property>
<property name="database">WSO2_DAS_EVENT</property>
</properties>
</analytics-record-store>
At startup I get the follow error: org.wso2.carbon.datasource.reader.mongo.MongoDa
taSourceReader cannot be found
UPDATE: I have added the missing library org.wso2.carbon.datasource.reader.mongo-4.4.33.jar
and now I get the follow error:
TID: [-1234] [] [2018-03-05 13:47:10,701] WARN {org.wso2.carbon.metrics.impl.MetricServiceImpl} - Failed to build the reporter {org.wso2.carbon.metrics.impl.MetricServiceImpl}
org.wso2.carbon.metrics.impl.util.ReporterBuildException: Error when looking up the Data Source: 'jdbc/WSO2MetricsDB'.
at org.wso2.carbon.metrics.impl.util.JDBCReporterBuilder.build(JDBCReporterBuilder.java:174)
at org.wso2.carbon.metrics.impl.util.JDBCReporterBuilder.build(JDBCReporterBuilder.java:33)
at org.wso2.carbon.metrics.impl.MetricServiceImpl.<init>(MetricServiceImpl.java:201)
at org.wso2.carbon.metrics.impl.MetricServiceImpl.<init>(MetricServiceImpl.java:65)
...
at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:243)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:438)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:1)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:340)
Caused by: javax.naming.NameNotFoundException: Name [WSO2MetricsDB] is not bound in this Context. Unable to find [WSO2MetricsDB].
at org.apache.naming.NamingContext.lookup(NamingContext.java:825)
at org.apache.naming.NamingContext.lookup(NamingContext.java:159)
at org.apache.naming.NamingContext.lookup(NamingContext.java:836)
at org.apache.naming.NamingContext.lookup(NamingContext.java:173)
at org.wso2.carbon.context.internal.CarbonContextDataHolder$CarbonInitialJNDIContext.lookup(CarbonContextDataHolder.java:709)
at javax.naming.InitialContext.lookup(InitialContext.java:417)
at org.wso2.carbon.metrics.impl.util.JDBCReporterBuilder.build(JDBCReporterBuilder.java:172)
... 86 more
What's missing/wrong in my configuration?
Thank in advance for any help
Marco