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Advise to cache Metric instance

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This commit is contained in:
Andrew Noyes
2025-08-31 14:43:34 -04:00
parent 58649103e5
commit 8b828be0a9
1 changed files with 8 additions and 4 deletions
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12
src/metric.hpp
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@@ -123,10 +123,14 @@ template <class T> struct Family {
static_assert(std::is_same_v<T, Counter> || std::is_same_v<T, Gauge> || static_assert(std::is_same_v<T, Counter> || std::is_same_v<T, Gauge> ||
std::is_same_v<T, Histogram>); std::is_same_v<T, Histogram>);
// Create metric instance with specific labels // Create metric instance with specific labels.
// Labels are sorted by key for Prometheus compatibility // For performance, it is recommended to create instances once and cache them
// ERROR: Will abort if labels already registered via register_callback() // for reuse, rather than calling .create() repeatedly in
// OK: Multiple calls with same labels return same instance (idempotent) // performance-critical paths.
//
// Labels are sorted by key for Prometheus compatibility.
// ERROR: Will abort if labels already registered via register_callback().
// OK: Multiple calls with same labels return same instance (idempotent).
T create(std::initializer_list<std::pair<std::string_view, std::string_view>> T create(std::initializer_list<std::pair<std::string_view, std::string_view>>
labels) { labels) {
return create( return create(