No data for some UIM metrics, how to identify if the issue is related to the OIConnector or an issue in DX O2?

Products

• DX Operational Observability

Issue/Introduction

The metric values for specific uim service are missing in DX O2, values are reported correctly in UIM Console but not in DX OI

UIM Console:

vs.

DX OI > Performance Analytics

 

The below ERROR message is found in the OIConnector log 

[QOS_PROCESSOR_THREAD-2, oi_connector] Can't post metric values as there is no metric_unique_id for this record :

Environment

• DX O2
• UIM + OI_connector probe

Resolution

DX O2 fetches metric data from the metric store - NASS in this situation it looks like data is missing in NASS.

To confirm this condition:

STEP 1: Obtain the metric-id:

-Open the Developer Tools

-Selecting the metric

-Check for /metricchart api call.

-You should be able to see the metric id in the request as in below screenshot example:

STEP 2: Query DX O2 NASS by running the below query using Postman or any other similar client REST tool

POST <apmservices-gateway-url>/nass/metricValue/fetch
{
    "metrics": [
      "<metric-id>"
     ],
    "rangeSize":86400
}

Content-Type:application/json
Authorization: Bearer <tenant-token>

If the above query returns no data, it means a UIM OI connector issue pushing data to DX O2