The Span Interface specifies a series of timed application events that have a start and end time. Below describes the conventions for the Span interface for the data field on the span.
Keys on the data field should be lower-case and use underscores instead of camel-case. There are some exceptions to this, but these exist because of backwards compatability.
Below describes the conventions for the Span interface for the data field on the span that are currently used by the product or are important to bring up.
HTTP
Attribute
Type
Description
Examples
http.query
string
The Query string present in the URL.
?foo=bar&bar=baz
http.fragment
string
The Fragments present in the URI (Browser SDKs only).
#foo=bar
http.request.method
string
The HTTP method used.
GET
http.response.status_code
int
The status HTTP response.
404
http.response_content_length
number
The encoded body size of the response (in bytes).
123
http.decoded_response_body_length
number
The decoded body size of the response (in bytes).
456
http.response_transfer_size
number
The transfer size of the response (in bytes).
789
Mobile
Attribute
Type
Description
Examples
blocked_main_thread
boolean
Whether the main thread was blocked by the span.
true
call_stack
StackFrame[]
The most relevant stack frames, that lead to the File I/O span. The stack frame should adhere to the StackFrame interface.
The name of the operation being executed, e.g. the MongoDB command name such as findAndModify, or the SQL keyword. Based on OpenTelemetry's call level db attributes
SELECT
db.name
string
This attribute is used to report the name of the database being accessed. For commands that switch the database, this should be set to the target database (even if the command fails).
customers
server.address
string
Name of the database host.
example.com
server.port
int
Logical server port number host.
8080
server.socket.address
string
Physical server IP address or Unix socket address. host.
10.5.3.2
server.socket.port
int
Physical server port. host.
16456
Web Server
Attribute
Type
Description
Examples
cache.hit
boolean
If the cache was hit during this span.
true
cache.item_size
int
The size of the requested item in the cache. In bytes.
58
Thread
Attribute
Type
Description
Examples
thread.id
string
Thread identifier of the thread that the span originated from.
123456
thread.name
string
Thread label identifying a thread.
main
Deprecated
Names that SDKs are still sending so we cannot remove them yet, but should not be used in new code.