DX APM Agents-UMA is not reporting events.

Products

• DX Operational Intelligence
• DX Operational Observability
• DX OI SaaS
• DX Application Performance Management
• DX APM SaaS
• DX SaaS

Issue/Introduction

We have installed and configured the UMA agent.
We have enabled event metrics but our dashboard is not showing anything. 
Is there perhaps something we missed?

Environment

DX OI 2*

DXO2

DX APM 

Cause

Checking clusterinfo pod that belongs to UMA agent errors shown below can be found:

ERROR c.c.a.b.events.OIDataPublisher.send - Exception seen when ingesting the events data 400 Bad Request: "{"_message":"index_name  is missing.","_code":"2004"}"
ERROR c.c.a.b.events.OIDataPublisher.send - Exception seen when ingesting the events data 400 Bad Request: "{"_message":"index_name  is missing.","_code":"2004"}"

Resolution

Add the following block to ConfigMap (ingress-nginx-controller) of the ingress-ngnix namespace:

data:
  enable-underscores-in-headers: "true"