const char* getIp(void) {
return "192.168.1.1";
}

above should be

const char* getIp(const el::LogMessage *l) {
return "192.168.1.1";
}

For completion, we should offer an As method like the one in Go 1.13 errors (https://golang.org/pkg/errors/#As). We should try to make this more reliable than Go's version by preventing panics: "As will panic if target is not a non-nil pointer to either a type that implements error, or to any interface type." Seems like we could just return false in these cases instead.

Description

A lot of console.warn yellow warning message when the data pass to leaveBreadcrumbs contains functions.

Describe the solution you'd like

Where are "the docs" mentioned in the last line of the README ?

See the docs for all of the supported formatting options