Built-in Properties

All Seq events expose a set of built-in properties that are distinguished by the @ symbol in their name:

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    Description
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    Example Contents
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    Usage
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  <td style={{ textAlign: "left" }}>
    An integer indicating the order in which the event arrived at the Seq server
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    *12344*
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    `@Arrived <= Arrived('event-d8ce...0000')`
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    `@Data`
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    The internal representation of the event as a single structured object.
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    *\{ "@t": ... }*
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    `Contains(ToJson(@Data), 'coffee')`
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    `@EventType`
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    A hash of the *message template* that was used to generate the event
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    *0x5432a8ff*
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    `@EventType <> 0x5432a8ff`
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    `@Exception`
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    The exception associated with the event if any, as a string
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    *System.InvalidOp...*
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    `@Exception like '%zero%'`
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    `@Id`
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    The event's unique id in Seq
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    *event-d8ce...0000*
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    `@Id = 'event-d8ce...0000'`
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    `@Level`
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    The logging level of the event, as a string
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    Warning
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    `@Level <> 'Warning'`
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    `@Message`
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    The text message associated with the event
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    *Failed to open file...*
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    `@RenderedMessage like 'Failed%'`
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    `@MessageTemplate`
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    The message template used to generate the event
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    *Logged in \{Username}*
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    `@MessageTemplate = 'Logged in {Username}'`
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    `@Properties`
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    A dictionary with all properties associated with the event *(Seq 3.1)*
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    `{"Name": "alice.example", "ThreadId": 10}`
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    `@Properties['some irregular identifier']`
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    `@Timestamp`
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    The UTC timestamp associated with the event
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    *2015-02-28T13:56:20.293Z*
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    `@Timestamp > DateTime('2015-01-13 06:00Z')`
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👍

Quick filter shortcuts

Many queries listed here are provided as one-click shortcuts via the row of blue links beneath the message text in an expanded log event - Id, Level, Type and so-on.