Span

A span is a unit of work or a single operation during the request processing.

JSON representation 
{
  "name": string,
  "startTime": string,
  "endTime": string,
  "duration": string,
  "attributes": {
    object
  },
  "childSpans": [
    {
      object (Span)
    }
  ]
}
Fields
name

string

Output only. The name of the span.
startTime

string (Timestamp format)

Output only. The start time of the span.

Uses RFC 3339, where generated output will always be Z-normalized and use 0, 3, 6 or 9 fractional digits. Offsets other than "Z" are also accepted. Examples: "2014-10-02T15:01:23Z", "2014-10-02T15:01:23.045123456Z" or "2014-10-02T15:01:23+05:30".
endTime

string (Timestamp format)

Output only. The end time of the span.

Uses RFC 3339, where generated output will always be Z-normalized and use 0, 3, 6 or 9 fractional digits. Offsets other than "Z" are also accepted. Examples: "2014-10-02T15:01:23Z", "2014-10-02T15:01:23.045123456Z" or "2014-10-02T15:01:23+05:30".
duration

string (Duration format)

Output only. The duration of the span.

A duration in seconds with up to nine fractional digits, ending with 's'. Example: "3.5s".
attributes

object (Struct format)

Output only. Key-value attributes associated with the span.
childSpans[]

object (Span)

Output only. The child spans that are nested under this span.