DX OI - No data for some UIM metrics. How to identify if the issue is related to the OIConnector or DX OI?

Products

• DX Operational Intelligence

Issue/Introduction

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

UIM Console:

vs. DX OI > Performance Analytics

 

The below ERROR message is reported many times in the OIConnector log 

Jul 17 17:53:16:024 [QOS_PROCESSOR_THREAD-2, oi_connector] Can't post metric values as there is no metric_unique_id for this record :

Environment

 DX OI 21.3.1HF1 + apm bridge- 1.07 + OI Connector- 1.45T3

Resolution

Performance Analytics fetches metric data from the metric store - NASS in this situation it looks like data could be missing in NASS.

To confirm this condition:

STEP 1: Obtain the metric-id:

Open the Developer Tools when selecting the metric in PA. Check for /metricchart api call. You should be able to see the metric id in the request -

STEP 2: Query 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, then it could be a connector issue in pushing data to OI.