Explore documentation
Advanced guide
Live tail message format
Live tail output of each source can be customized in Live tail by clicking on the gear icon in the upper right corner:
The Live tail message format is a freeform text template with columns wrapped in {column}
brackets.
LEVEL: {level}, PID: {context.system.pid}, THREAD: {context.runtime.thread_id}
Conditional rendering can be achieved by piping multiple values
LEVEL: {level}, THREAD or PID: {context.runtime.thread_id|context.system.pid}
If you have special characters in your fields such as dots, you can use square brackets instead:
LEVEL: {level}, THREAD: {context["thread.id"]}
Colors
You can format and color your logs using a subset of ANSI codes in your log messages.
For example, this is how you could format your logs using our JavaScript client:
logger.info("Logs can be \u001B[1mbold\u001B[0m, \u001B[31mred\u001B[0m, or \u001B[1;32mbold green\u001B[0m.");
Here's the result you would see in Live tail:
Supported colors
Live tail supports 31-36
and 91-96
code ranges for colors in both light and dark themes.
Supported font styles
- Bold: ANSI code
1
- Light: ANSI code
2
- Italic: ANSI code
3
- Underline: ANSI code
4
Style reset
Each font color or style needs to be reset by reset all modes
(0
) ANSI code. Better Stack Live tail doesn't support resetting a color or a style by starting a new one.
Manual casting
Live tail automatically casts certain fields to enable color formatting, but you can manually specify the casting type when needed using the ::text
syntax:
{custom.msg::text}
This manual casting ensures that color formatting in your custom fields is properly interpreted and displayed when the automatic detection doesn't handle your specific use case.