ZhengweiZhu commented on code in PR #2899:
URL: https://github.com/apache/brpc/pull/2899#discussion_r1967007899
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src/brpc/builtin/prometheus_metrics_service.cpp:
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@@ -102,9 +103,14 @@ bool PrometheusMetricsDumper::dump(const std::string& name,
auto metrics_name = GetMetricsName(name);
- *_os << "# HELP " << metrics_name << '\n'
- << "# TYPE " << metrics_name << " gauge" << '\n'
- << name << " " << desc << '\n';
+ // To meet specification of prometheus metric, there should be only
+ // one TYPE field for the same metric name.
+ if (metrics_name.as_string() != _last_metric_name) {
Review Comment:
Let me add some background knowledge. The metrics are stored in
butil::FlatMap and the uniqueness of metric name is guaranteed. The problem
arises from the introduction of mvar, where one metric name will correspond to
multiple metric with different labels. My patch just handles this problem
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