Span Interface

The Span Interface specifies a series of timed application events that have a start and end time.

A Transaction may contain zero or more Spans in an array attribute named spans. Spans in the list don't have to be ordered, they will be ordered by start / end time on the Server.

While Span attributes will be normalized on the server, a Span is most useful when it includes at least an op and description.

Attributes

event_id

Required. Hexadecimal string representing a uuid4 value. The length is exactly 32 characters. Dashes are not allowed. Has to be lowercase.

{
  "event_id": "fc6d8c0c43fc4630ad850ee518f1b9d0"
}

tags

Optional. A map or list of tags for this event. Each tag must be less than 200 characters.

{
  "tags": {
    "ios_version": "4.0",
    "context": "production"
  }
}

trace_id:

Required. Determines which trace the Span belongs to. The value should be 16 random bytes encoded as a hex string (32 characters long).

{
  "trace_id": "1e57b752bc6e4544bbaa246cd1d05dee"
}

op

Recommended. Short code identifying the type of operation the span is measuring.

{
  "op": "sql.query"
}

description

Optional. Longer description of the span's operation, which uniquely identifies the span but is consistent across instances of the span.

{
  "description": "SELECT * FROM users WHERE last_active < DATE_SUB(CURRENT_DATE, INTERVAL 1 YEAR)`"
}

start_timestamp

Required. A timestamp representing when the measuring started. The format is either a string as defined in RFC 3339 or a numeric (integer or float) value representing the number of seconds that have elapsed since the Unix epoch. The start_timestamp value must be greater or equal the timestamp value, otherwise the Span is discarded as invalid.

{
  "start_timestamp": "2011-05-02T17:41:36.242Z"
}

or:

{
  "start_timestamp": 1304358096.242
}

timestamp

Required. A timestamp representing when the measuring finished. The format is either a string as defined in RFC 3339 or a numeric (integer or float) value representing the number of seconds that have elapsed since the Unix epoch.

{
  "timestamp": "2011-05-02T17:41:36.955Z"
}

or:

{
  "timestamp": 1304358096.955
}

status

Optional. Describes the status of the Span/Transaction.

{
  "status": "ok"
}

tags

Optional. A map or list of tags for this event. Each tag must be less than 200 characters.

{
  "tags": {
    "ios_version": "4.0",
    "context": "production"
  }
}

data

Optional. Arbitrary data associated with this Span.

{
  "data": {
    "url": "http://localhost:8080/sockjs-node/info?t=1588601703755",
    "status_code": 200,
    "type": "xhr",
    "method": "GET"
  }
}

Examples

The following example illustrates the Span as part of the Transaction and omits other attributes for simplicity.

{
  "spans": [
    {
      "start_timestamp": 1588601261.481961,
      "description": "GET /sockjs-node/info",
      "tags": {
        "http.status_code": "200"
      },
      "timestamp": 1588601261.488901,
      "parent_span_id": "b0e6f15b45c36b12",
      "trace_id": "1e57b752bc6e4544bbaa246cd1d05dee",
      "op": "http",
      "data": {
        "url": "http://localhost:8080/sockjs-node/info?t=1588601703755",
        "status_code": 200,
        "type": "xhr",
        "method": "GET"
      },
      "span_id": "b01b9f6349558cd1"
    },
    {
      "start_timestamp": 1588601261.535386,
      "description": "Vue <App>",
      "timestamp": 1588601261.544196,
      "parent_span_id": "9312d0d18bf51736",
      "trace_id": "1e57b752bc6e4544bbaa246cd1d05dee",
      "op": "update",
      "span_id": "b980d4dec78d7344"
    }
  ]
}