AlinsRan opened a new pull request, #13342:
URL: https://github.com/apache/apisix/pull/13342
## Summary
This PR introduces the `traffic-label` plugin, which assigns configurable
labels to requests based on weighted random distribution rules.
## Description
The `traffic-label` plugin selects a label from a configured set of weighted
labels and writes it to a request header or APISIX variable. Multiple rules can
be configured, each with an optional match condition using `resty.expr`
expressions. The first matching rule is applied; if no rule matches, the plugin
is a no-op.
**Use cases:**
- A/B testing by tagging requests and routing based on the label
- Canary deployments with weighted traffic splitting at the label level
- Request classification for observability and analytics
## Key features
- Weighted random label selection per rule
- Optional `resty.expr`-based match conditions
- Writes selected label to a request header or APISIX variable
- First-match semantics across multiple rules
## Files changed
- `apisix/plugins/traffic-label.lua` — plugin implementation
- `t/plugin/traffic-label.t` — basic test cases
- `t/plugin/traffic-label2.t` — extended test cases
- `docs/en/latest/plugins/traffic-label.md` — English documentation
- `docs/zh/latest/plugins/traffic-label.md` — Chinese documentation
- `apisix/cli/config.lua` — register plugin in default list
- `docs/en/latest/config.json` / `docs/zh/latest/config.json` — add to
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