ตั้งค่าปลั๊กอิน OpenTelemetry พื้นฐานใน gRPC Go

1. บทนำ

ในโค้ดแล็บนี้ คุณจะได้ใช้ gRPC เพื่อสร้างไคลเอ็นต์และเซิร์ฟเวอร์ซึ่งเป็นรากฐานของแอปพลิเคชันการแมปเส้นทางที่เขียนด้วยภาษา Go

เมื่อสิ้นสุดบทแนะนำนี้ คุณจะมีแอปพลิเคชัน gRPC HelloWorld แบบง่ายๆ ที่ติดตั้งปลั๊กอิน gRPC OpenTelemetry และจะดูเมตริกการสังเกตการณ์ที่ส่งออกใน Prometheus ได้

สิ่งที่คุณจะได้เรียนรู้

  • วิธีตั้งค่าปลั๊กอิน OpenTelemetry สำหรับแอปพลิเคชัน gRPC Go ที่มีอยู่
  • การเรียกใช้อินสแตนซ์ Prometheus ในเครื่อง
  • ส่งออกเมตริกไปยัง Prometheus
  • ดูเมตริกจากแดชบอร์ด Prometheus

2. ก่อนเริ่มต้น

สิ่งที่คุณต้องมี

ติดตั้งข้อกำหนดเบื้องต้น

sudo apt-get update -y
sudo apt-get upgrade -y
sudo apt-get install -y git curl
go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest

รับโค้ด

Codelab นี้มีโครงร่างซอร์สโค้ดที่สร้างไว้ล่วงหน้าเพื่อช่วยให้คุณเริ่มต้นใช้งานได้ง่ายขึ้น ขั้นตอนต่อไปนี้จะแนะนําคุณตลอดการติดตั้งใช้งานปลั๊กอิน gRPC OpenTelemetry ในแอปพลิเคชัน

grpc-codelabs

ซอร์สโค้ดโครงร่างสำหรับ Codelab นี้อยู่ในไดเรกทอรีนี้ใน GitHub หากไม่ต้องการติดตั้งใช้งานโค้ดด้วยตนเอง คุณจะดูซอร์สโค้ดที่เสร็จสมบูรณ์ได้ในไดเรกทอรี completed

ก่อนอื่น ให้โคลนที่เก็บโค้ดแล็บ grpc แล้ว cd ไปยังโฟลเดอร์ grpc-go-opentelemetry

git clone https://github.com/grpc-ecosystem/grpc-codelabs.git
cd grpc-codelabs/codelabs/grpc-go-opentelemetry/

หรือคุณจะดาวน์โหลดไฟล์ .zip ที่มีเฉพาะไดเรกทอรี Codelab แล้วแตกไฟล์ด้วยตนเองก็ได้

3. ลงทะเบียนปลั๊กอิน OpenTelemetry

เราต้องมีแอปพลิเคชัน gRPC เพื่อเพิ่มปลั๊กอิน gRPC OpenTelemetry ใน Codelab นี้ เราจะใช้ไคลเอ็นต์และเซิร์ฟเวอร์ gRPC HelloWorld แบบง่ายๆ ซึ่งเราจะติดตั้งเครื่องมือด้วยปลั๊กอิน OpenTelemetry ของ gRPC

ตั้งค่าการวัดผลในไคลเอ็นต์

ขั้นตอนแรกคือการลงทะเบียนปลั๊กอิน OpenTelemetry ที่กำหนดค่าด้วยเครื่องมือส่งออก Prometheus ในไคลเอ็นต์ เปิด codelabs/grpc-go-opentelemetry/start_here/client/main.go ด้วยโปรแกรมแก้ไขที่คุณชื่นชอบ แล้วเปลี่ยน main() เพื่อเพิ่มโค้ดในการตั้งค่าปลั๊กอิน gRPC Go Otel

สร้างเครื่องมือส่งออก Prometheus ใหม่

ข้อมูลโค้ดต่อไปนี้จะสร้าง Prometheus Exporter ใหม่

exporter, err := prometheus.New()
if err != nil {
        log.Fatalf("Failed to start prometheus exporter: %v", err)
}

เริ่มตัวส่งออก Prometheus

สร้าง Goroutine ใหม่ที่ใช้ net/http เพื่อฟังและให้บริการที่อยู่ที่ส่งผ่านโดยแฟล็ก prometheus_endpoint

go http.ListenAndServe(*prometheusEndpoint, promhttp.Handler())

สร้าง DialOption ด้วยปลั๊กอิน OpenTelemetry

ใช้เมธอด DialOption ของ gRPC Otel ตั้งค่า DialOption โดยใช้ Prometheus Meter Provider

provider := metric.NewMeterProvider(metric.WithReader(exporter))
do := opentelemetry.DialOption(opentelemetry.Options{MetricsOptions: opentelemetry.MetricsOptions{MeterProvider: provider}})

ส่ง DialOption เมื่อเชื่อมต่อกับเซิร์ฟเวอร์

ส่ง do ไปยัง gRPC.NewClient

ระบบจะระบุ MeterProvider นี้ให้กับปลั๊กอิน OpenTelemetry ของ gRPC เป็นการกำหนดค่า เมื่อลงทะเบียนปลั๊กอิน OpenTelemetry ทั่วโลกแล้ว ไคลเอ็นต์และเซิร์ฟเวอร์ gRPC ทั้งหมดจะได้รับการวัดผลด้วย OpenTelemetry

ตั้งค่าการตรวจสอบในเซิร์ฟเวอร์

ในทำนองเดียวกัน เรามาเพิ่มปลั๊กอิน OpenTelemetry ลงในเซิร์ฟเวอร์ด้วยกัน เปิด codelabs/grpc-go-opentelemetry/start_here/server/main.go และโค้ดเพื่อตั้งค่าปลั๊กอิน gRPC Go Otel

สร้างเครื่องมือส่งออก Prometheus ใหม่

exporter, err := prometheus.New()
if err != nil {
        log.Fatalf("Failed to start prometheus exporter: %v", err)
}

สร้างผู้ให้บริการมิเตอร์รายใหม่ด้วยตัวส่งออก Prometheus

provider := metric.NewMeterProvider(metric.WithReader(exporter))
go http.ListenAndServe(*prometheusEndpoint, promhttp.Handler())

so := opentelemetry.ServerOption(opentelemetry.Options{MetricsOptions: opentelemetry.MetricsOptions{MeterProvider: provider}})

ส่งตัวเลือกเซิร์ฟเวอร์นี้ไปยัง gRPC.NewServer

4. การเรียกใช้ตัวอย่างและการดูเมตริก

หากต้องการเรียกใช้เซิร์ฟเวอร์ ให้เรียกใช้ -

cd server
go mod tidy
go run .

หากตั้งค่าสำเร็จ คุณจะเห็นเอาต์พุตต่อไปนี้สำหรับเซิร์ฟเวอร์

Serving on :50051

ขณะที่เซิร์ฟเวอร์ทำงาน ให้เรียกใช้ไคลเอ็นต์ในเทอร์มินัลอื่นโดยใช้คำสั่งต่อไปนี้

cd client
go mod tidy
go run .

การเรียกใช้ที่สำเร็จจะมีลักษณะดังนี้

message:"this is examples/opentelemetry (from :50051)"
message:"this is examples/opentelemetry (from :50051)"
message:"this is examples/opentelemetry (from :50051)"

เนื่องจากเราได้ตั้งค่าปลั๊กอิน gRPC OpenTelemetry เพื่อส่งออกเมตริกโดยใช้ Prometheus เมตริกเหล่านั้นจะพร้อมใช้งานใน localhost:9464 สำหรับเซิร์ฟเวอร์และ localhost:9465 สำหรับไคลเอ็นต์

วิธีดูเมตริกไคลเอ็นต์

curl localhost:9465/metrics

ผลลัพธ์จะมีรูปแบบดังนี้

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go_memstats_heap_idle_bytes 4.75136e+06
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# HELP go_memstats_heap_sys_bytes Number of heap bytes obtained from system. Equals to /memory/classes/heap/objects:bytes + /memory/classes/heap/unused:bytes + /memory/classes/heap/released:bytes + /memory/classes/heap/free:bytes.
# TYPE go_memstats_heap_sys_bytes gauge
go_memstats_heap_sys_bytes 7.733248e+06
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# HELP go_memstats_mallocs_total Total number of heap objects allocated, both live and gc-ed. Semantically a counter version for go_memstats_heap_objects gauge. Equals to /gc/heap/allocs:objects + /gc/heap/tiny/allocs:objects.
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# HELP go_memstats_mspan_inuse_bytes Number of bytes in use by mspan structures. Equals to /memory/classes/metadata/mspan/inuse:bytes.
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# HELP go_memstats_other_sys_bytes Number of bytes used for other system allocations. Equals to /memory/classes/other:bytes.
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# HELP go_memstats_stack_inuse_bytes Number of bytes obtained from system for stack allocator in non-CGO environments. Equals to /memory/classes/heap/stacks:bytes.
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# HELP go_memstats_stack_sys_bytes Number of bytes obtained from system for stack allocator. Equals to /memory/classes/heap/stacks:bytes + /memory/classes/os-stacks:bytes.
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grpc_client_attempt_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.2"} 0
grpc_client_attempt_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.25"} 0
grpc_client_attempt_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.3"} 0
grpc_client_attempt_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.4"} 0
grpc_client_attempt_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.5"} 0
grpc_client_attempt_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.65"} 0
grpc_client_attempt_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.8"} 0
grpc_client_attempt_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="1"} 0
grpc_client_attempt_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="2"} 0
grpc_client_attempt_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="5"} 26
grpc_client_attempt_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="10"} 26
grpc_client_attempt_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="20"} 26
grpc_client_attempt_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="50"} 26
grpc_client_attempt_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="100"} 26
grpc_client_attempt_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="+Inf"} 26
grpc_client_attempt_duration_seconds_sum{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev"} 52.09275054499999
grpc_client_attempt_duration_seconds_count{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev"} 26
# HELP grpc_client_attempt_rcvd_total_compressed_message_size_bytes Compressed message bytes received per call attempt.
# TYPE grpc_client_attempt_rcvd_total_compressed_message_size_bytes histogram
grpc_client_attempt_rcvd_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0"} 0
grpc_client_attempt_rcvd_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="1024"} 26
grpc_client_attempt_rcvd_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="2048"} 26
grpc_client_attempt_rcvd_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="4096"} 26
grpc_client_attempt_rcvd_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="16384"} 26
grpc_client_attempt_rcvd_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="65536"} 26
grpc_client_attempt_rcvd_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="262144"} 26
grpc_client_attempt_rcvd_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="1.048576e+06"} 26
grpc_client_attempt_rcvd_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="4.194304e+06"} 26
grpc_client_attempt_rcvd_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="1.6777216e+07"} 26
grpc_client_attempt_rcvd_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="6.7108864e+07"} 26
grpc_client_attempt_rcvd_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="2.68435456e+08"} 26
grpc_client_attempt_rcvd_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="1.073741824e+09"} 26
grpc_client_attempt_rcvd_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="4.294967296e+09"} 26
grpc_client_attempt_rcvd_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="+Inf"} 26
grpc_client_attempt_rcvd_total_compressed_message_size_bytes_sum{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev"} 1196
grpc_client_attempt_rcvd_total_compressed_message_size_bytes_count{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev"} 26
# HELP grpc_client_attempt_sent_total_compressed_message_size_bytes Compressed message bytes sent per client call attempt.
# TYPE grpc_client_attempt_sent_total_compressed_message_size_bytes histogram
grpc_client_attempt_sent_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0"} 0
grpc_client_attempt_sent_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="1024"} 26
grpc_client_attempt_sent_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="2048"} 26
grpc_client_attempt_sent_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="4096"} 26
grpc_client_attempt_sent_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="16384"} 26
grpc_client_attempt_sent_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="65536"} 26
grpc_client_attempt_sent_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="262144"} 26
grpc_client_attempt_sent_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="1.048576e+06"} 26
grpc_client_attempt_sent_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="4.194304e+06"} 26
grpc_client_attempt_sent_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="1.6777216e+07"} 26
grpc_client_attempt_sent_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="6.7108864e+07"} 26
grpc_client_attempt_sent_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="2.68435456e+08"} 26
grpc_client_attempt_sent_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="1.073741824e+09"} 26
grpc_client_attempt_sent_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="4.294967296e+09"} 26
grpc_client_attempt_sent_total_compressed_message_size_bytes_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="+Inf"} 26
grpc_client_attempt_sent_total_compressed_message_size_bytes_sum{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev"} 832
grpc_client_attempt_sent_total_compressed_message_size_bytes_count{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev"} 26
# HELP grpc_client_attempt_started_total Number of client call attempts started.
# TYPE grpc_client_attempt_started_total counter
grpc_client_attempt_started_total{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev"} 27
# HELP grpc_client_call_duration_seconds Time taken by gRPC to complete an RPC from application's perspective.
# TYPE grpc_client_call_duration_seconds histogram
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="1e-05"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="5e-05"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.0001"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.0003"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.0006"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.0008"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.001"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.002"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.003"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.004"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.005"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.006"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.008"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.01"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.013"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.016"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.02"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.025"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.03"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.04"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.05"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.065"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.08"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.1"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.13"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.16"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.2"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.25"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.3"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.4"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.5"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.65"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="0.8"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="1"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="2"} 0
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="5"} 26
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="10"} 26
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="20"} 26
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="50"} 26
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="100"} 26
grpc_client_call_duration_seconds_bucket{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev",le="+Inf"} 26
grpc_client_call_duration_seconds_sum{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev"} 52.35282954500001
grpc_client_call_duration_seconds_count{grpc_method="grpc.examples.echo.Echo/UnaryEcho",grpc_status="OK",grpc_target="dns:///:50051",otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev"} 26
# HELP otel_scope_info Instrumentation Scope metadata
# TYPE otel_scope_info gauge
otel_scope_info{otel_scope_name="grpc-go",otel_scope_version="1.67.0-dev"} 1
# HELP promhttp_metric_handler_requests_in_flight Current number of scrapes being served.
# TYPE promhttp_metric_handler_requests_in_flight gauge
promhttp_metric_handler_requests_in_flight 1
# HELP promhttp_metric_handler_requests_total Total number of scrapes by HTTP status code.
# TYPE promhttp_metric_handler_requests_total counter
promhttp_metric_handler_requests_total{code="200"} 1
promhttp_metric_handler_requests_total{code="500"} 0
promhttp_metric_handler_requests_total{code="503"} 0
# HELP target_info Target metadata
# TYPE target_info gauge
target_info{service_name="unknown_service:client",telemetry_sdk_language="go",telemetry_sdk_name="opentelemetry",telemetry_sdk_version="1.28.0"} 1

ในทำนองเดียวกัน สำหรับเมตริกฝั่งเซิร์ฟเวอร์ ให้ทำดังนี้

curl localhost:9464/metrics

5. การดูเมตริกใน Prometheus

ในที่นี้ เราจะตั้งค่าอินสแตนซ์ Prometheus ที่จะคัดลอกไคลเอ็นต์และเซิร์ฟเวอร์ตัวอย่าง gRPC ที่ส่งออกเมตริกโดยใช้ Prometheus

ดาวน์โหลดรุ่นล่าสุดของ Prometheus สำหรับแพลตฟอร์มของคุณ จากนั้นแตกไฟล์และเรียกใช้

tar xvfz prometheus-*.tar.gz
cd prometheus-*

สร้างไฟล์การกำหนดค่า Prometheus ด้วยข้อมูลต่อไปนี้

cat > grpc_otel_go_prometheus.yml <<EOF
scrape_configs:
  - job_name: "prometheus"
    scrape_interval: 5s
    static_configs:
      - targets: ["localhost:9090"]
  - job_name: "grpc-otel-go"
    scrape_interval: 5s
    static_configs:
      - targets: ["localhost:9464", "localhost:9465"]
EOF

เริ่ม Prometheus ด้วยการกำหนดค่าใหม่ -

./prometheus --config.file=grpc_otel_go_prometheus.yml

ซึ่งจะกำหนดค่าเมตริกจากกระบวนการ Codelab ของไคลเอ็นต์และเซิร์ฟเวอร์ให้มีการขูดทุกๆ 5 วินาที

ไปที่ http://localhost:9090/graph เพื่อดูเมตริก ตัวอย่างเช่น การค้นหา -

histogram_quantile(0.5, rate(grpc_client_attempt_duration_seconds_bucket[1m]))

จะแสดงกราฟที่มีเวลาในการตอบสนองของความพยายามที่ค่ามัธยฐานโดยใช้ 1 นาทีเป็นกรอบเวลาสำหรับการคำนวณควอนไทล์

อัตราการค้นหา -

increase(grpc_client_attempt_duration_seconds_bucket[1m])

6. (ไม่บังคับ) แบบฝึกหัดสำหรับผู้ใช้

คุณจะเห็นว่า QPS ต่ำในแดชบอร์ด Prometheus ดูว่าคุณระบุโค้ดที่น่าสงสัยในตัวอย่างที่จำกัด QPS ได้หรือไม่

สำหรับผู้ที่กระตือรือร้น รหัสไคลเอ็นต์จะจำกัดตัวเองให้มี RPC ที่รอดำเนินการเพียงรายการเดียวในขณะใดก็ตาม ซึ่งสามารถแก้ไขเพื่อให้ไคลเอ็นต์ส่ง RPC เพิ่มเติมได้โดยไม่ต้องรอให้ RPC ก่อนหน้าเสร็จสมบูรณ์ (ยังไม่มีวิธีแก้ปัญหานี้)