Zebra/book/src/user/tracing.md

Tracing Zebra

Zebra supports dynamic tracing, configured using the config's TracingSection and (optionally) an HTTP RPC endpoint.

If the endpoint_addr is specified, zebrad will open an HTTP endpoint allowing dynamic runtime configuration of the tracing filter. For instance, if the config had endpoint_addr = '127.0.0.1:3000', then

• curl -X GET localhost:3000/filter retrieves the current filter string;
• curl -X POST localhost:3000/filter -d "zebrad=trace" sets the current filter string.

See the filter documentation for more details.

Zebra also has support for:

• Generating flamegraphs of tracing spans, configured using the flamegraph option.
• Sending tracing spans and events to systemd-journald, on Linux distributions that use systemd. Configured using the use_journald option.