From 3a28d741e9d24504b001acd3f077567949e44989 Mon Sep 17 00:00:00 2001
From: "Zimin A.N." <zimin.an@nstart.space>
Date: Wed, 6 May 2026 11:10:33 +0300
Subject: [PATCH] =?UTF-8?q?feat(metrics):=20=D0=B2=D0=BA=D0=BB=D1=8E=D1=87?=
 =?UTF-8?q?=D0=B8=D1=82=D1=8C=20percentiles-histogram=20=D0=B4=D0=BB=D1=8F?=
 =?UTF-8?q?=20http.server.requests?=
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Spring Boot Micrometer по дефолту эмитит только _count/_sum/_max
для http.server.requests — без _bucket нельзя посчитать
histogram_quantile() в Prometheus, p50/p95/p99 latency дашборды
получают "No data".

Включён percentiles-histogram + кастомные SLO bucket boundaries
от 5ms до 5s — покрывают realistic range read-api JSON endpoints.
Server-side histograms точнее client-side percentiles (по которым
нельзя aggregate across instances).

Применить: build + push image + helm upgrade. После рестарта
ordinis-app/read-api/projection-writer Grafana дашборды покажут
latency графики.
---
 ordinis-app/src/main/resources/application.yml       |  7 +++++++
 .../src/main/resources/application.yml               |  5 +++++
 ordinis-read-api/src/main/resources/application.yml  | 12 ++++++++++++
 3 files changed, 24 insertions(+)

diff --git a/ordinis-app/src/main/resources/application.yml b/ordinis-app/src/main/resources/application.yml
index e492271..cfca407 100644
--- a/ordinis-app/src/main/resources/application.yml
+++ b/ordinis-app/src/main/resources/application.yml
@@ -32,6 +32,13 @@ management:
     tags:
       application: ${spring.application.name}
       environment: ${ENVIRONMENT:dev}
+    distribution:
+      # Server-side histogram buckets для http.server.requests — нужны
+      # histogram_quantile() в Grafana p50/p95/p99 dashboards.
+      percentiles-histogram:
+        http.server.requests: true
+      slo:
+        http.server.requests: 5ms,10ms,25ms,50ms,100ms,250ms,500ms,1s,2s,5s
 
 otel:
   exporter:
diff --git a/ordinis-projection-writer/src/main/resources/application.yml b/ordinis-projection-writer/src/main/resources/application.yml
index 90f7b8d..39eac18 100644
--- a/ordinis-projection-writer/src/main/resources/application.yml
+++ b/ordinis-projection-writer/src/main/resources/application.yml
@@ -33,6 +33,11 @@ management:
     tags:
       application: ${spring.application.name}
       environment: ${ENVIRONMENT:dev}
+    distribution:
+      percentiles-histogram:
+        http.server.requests: true
+      slo:
+        http.server.requests: 5ms,10ms,25ms,50ms,100ms,250ms,500ms,1s,2s,5s
 
 logging:
   level:
diff --git a/ordinis-read-api/src/main/resources/application.yml b/ordinis-read-api/src/main/resources/application.yml
index 647d521..d398a90 100644
--- a/ordinis-read-api/src/main/resources/application.yml
+++ b/ordinis-read-api/src/main/resources/application.yml
@@ -31,6 +31,18 @@ management:
     tags:
       application: ${spring.application.name}
       environment: ${ENVIRONMENT:dev}
+    distribution:
+      # Включаем server-side histogram buckets для http.server.requests —
+      # без них histogram_quantile() в Prometheus возвращает empty
+      # (только _count/_sum/_max). Используется в Grafana dashboard
+      # ordinis-overview для p50/p95/p99 latency.
+      percentiles-histogram:
+        http.server.requests: true
+      # Service-level objectives bucket boundaries (на каких границах
+      # эмитить _bucket counters). Покрывают range от 5ms до 5s — типичный
+      # для read-api JSON endpoint.
+      slo:
+        http.server.requests: 5ms,10ms,25ms,50ms,100ms,250ms,500ms,1s,2s,5s
 
 otel:
   exporter: