Queries for the OTelLogs table

For information on using these queries in the Azure portal, see Log Analytics tutorial. For the REST API, see Query.

Log severity analysis

Analyze log distribution by severity level and service over the last hour.

OTelLogs
| where TimeGenerated > ago(1h)
| summarize
 LogCount = count(),
 UniqueTraces = dcount(TraceId),
 UniqueSpans = dcount(SpanId),
 SampleBodies = take_any(Body, 3)
 by ServiceName, SeverityText, SeverityNumber
| extend SeverityLevel = case(
 SeverityNumber <= 4, "Debug",
 SeverityNumber <= 8, "Info",
 SeverityNumber <= 12, "Warn",
 SeverityNumber <= 16, "Error",
 "Fatal"
)
| order by SeverityNumber desc, LogCount desc
| project ServiceName, SeverityText, SeverityLevel, SeverityNumber, LogCount, UniqueTraces, UniqueSpans, SampleBodies
| limit 100