str
Source file name. Depending on the runtime
environment, this might be a simple name or a
fully-qualified name.
line
int
Line within the source file.
function_name
str
Human-readable name of the function or method being invoked,
with optional context such as the class or package name.
This information is used in contexts such as the logs
viewer, where a file and line number are less meaningful.
The format can vary by language. For example:
``qual.if.ied.Class.method`` (Java), ``dir/package.func``
(Go), ``function`` (Python).
