Trace telemetry: Application Insights data model

Trace telemetry in Application Insights represents printf-style trace statements that are text searched. Log4Net, NLog, and other text-based log file entries are translated into instances of this type. The trace doesn't have measurements as an extensibility.


Trace message.

Maximum length: 32,768 characters

Severity level

Trace severity level.

Values: Verbose, Information, Warning, Error, and Critical

Custom properties

Name-value collection of custom properties: This collection is used to extend standard telemetry with the custom dimensions. Examples are the deployment slot that produced telemetry or the telemetry-item specific property like the order number.

  • Maximum key length: 150
  • Maximum value length: 8,192

Next steps