A customer is running an Avaya Oceana solution, and the technical engineer is troubleshooting an operational issue. The customer is using the centralized logging Kibana interface to debug the log files.
Which action can the engineer take to quickly file all the ERROR messages in the log files?

Consider the following ContextData for a Voice Channel Interaction:
ContextDatfl=S9iOxZBBTKiQ-pF9K-x8lw,VO,N
What is the significance of "VO"?

A customer is unable to login to the Agent Workspaces with Multimedia Channels. Given these log messages:
2018-04-24 07:01:11,358 [pool-128-thread-1] config.OcpOceanaMonitorWASProduction INFO -
[M:setOceanaHeartbeatMessage] [T:null].OceanaHeartbeatMessage.MessageText:[GigaSpaces Connection OK. Database connection is Broken. ORC Rest service is reachable (http 200).
AgentControllerService Alive, Cluster Status ACTIVE] Status: [ERROR]
2018-04-24 07:02:09,853 [pool-128-thread-1] serviceability.AgentControllerStatusTask ERROR
- [M:AgentControllerStatusRunnable] [T:null]. Error in DB Connection com.avaya.ocp.db.util.PersistenceException: java.sql.SQLException: [Cache JDBC] Communication link failure: Connection refused at com.avaya.ocp.db.util.DbConnFactoryDbcpPool.getDbConnection (DbConnFactoryDbcpPool.java:166) What is causing these log messages?

A customer reports that Avaya Oceana Workspace agents are not able to connect, and they want to troubleshoot Unified Agent Controller (UAC).
Which log will show more relevant logs for UAC?