Message templates
Message template is the text of a log message that can potentially contain placeholders filled with property values during rendering.
Placeholders are always specified in curly brackets:
Response code = {Code}.During rendering, placeholders are replaced with values of properties with corresponding names:
Response code = {Code} + {"Code": "200"} = Response code = 200Any mismatched brackets are kept as-is:
{key} template renders to the same text.Any placeholders without corresponding properties are replaced with empty strings.
Double curly brackets can be used to escape occurrences of curly brackets in text:
{{key}} template renders to {key} text.Do not pass a message as a message template.
For example, instead of
log.Info(json) you should use log.Info("{Json}", json).Otherwise, you may have performance issues (due to the internal templates cache) or corrupted messages (due to the rendering stage).
Last modified 3d ago