Aria Operations NSX-T metrics are showing Negative value randomly

Products

• VCF Operations

Issue/Introduction

• NSX Manager Transport Nodes are reporting negative values on the interfaces such as RX and TX Bytes : 
  Aria Operations -> Integrations -> NSX -> Metrics -> Transport Node -> Statistics -> Interface -> RX Bytes


• /storage/log/vcops/log/adapters/NSXTAdapter/NSXTAdapter_###.log has following warning:
  
   YYYY-MM-DDTHH:MM:12,535+0000 WARN  [NSX-T Metric Collector thread 9, time: Sat Jan 10 05:12:33 UTC 2026] (800) com.vmware.adapter3.nsxt.collector.managercollector.metrics.LogicalRouterMetricCollector.fetchRouterStatistics - Logical Router Stats in current cycle is lower than previous stats. Resulting in negative values - hence skipping the publishing of those metrics for current cycle for logical router : ####################YYYY-MM-DDTHH:MM:13,163+0000 WARN  [NSX-T Metric Collector thread 15, time: Sat Jan 10 05:12:33 UTC 2026] (800) com.vmware.adapter3.nsxt.collector.managercollector.metrics.LogicalRouterMetricCollector.fetchRouterStatistics - Logical Router Stats in current cycle is lower than previous stats. Resulting in negative values - hence skipping the publishing of those metrics for current cycle for logical router : ####################
YYYY-MM-DDTHH:MM:34,069+0000 ERROR [Collector worker thread 4] (800) com.vmware.adapter3.nsxt.util.NsxtApiUtil.getMPPolicyMigrationStats - Error in fetching the MP Policy Migration Stats, exception caused is:
com.vmware.vapi.std.errors.InternalServerError: InternalServerError (com.vmware.vapi.std.errors.internal_server_error) => {
    messages = [],
    data = struct => {error_message=upstream connect error or disconnect/reset before headers. retried and the latest reset reason: remote connection failure, transport failure reason: delayed connect error: 111, error_code=98, module_name=common-service},
    errorType = INTERNAL_SERVER_ERROR
}

Environment

Aria Operations 8.18.x

Resolution

This is currently a known issue and has been fixed in VCF 9.0.x

This will also be fixed in future patch release of Aria Operations 8.18.x