【2026年版】オブザーバビリティプラットフォーム比較：Datadog・Grafana Cloud・New Relicの選定ガイド

# docker-compose.yml - Datadog Agent
version: '3'
services:
  datadog-agent:
    image: gcr.io/datadoghq/agent:latest
    environment:
      - DD_API_KEY=${DD_API_KEY}
      - DD_SITE=datadoghq.com
      - DD_APM_ENABLED=true
      - DD_LOGS_ENABLED=true
      - DD_PROCESS_AGENT_ENABLED=true
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
      - /proc/:/host/proc/:ro
      - /sys/fs/cgroup/:/host/sys/fs/cgroup:ro
    ports:
      - "8126:8126"  # APM
      - "8125:8125"  # DogStatsD

# Datadog Agent on Kubernetes (Helm values)
datadog:
  apiKey: <YOUR_API_KEY>
  appKey: <YOUR_APP_KEY>
  site: datadoghq.com
  logs:
    enabled: true
    containerCollectAll: true
  apm:
    portEnabled: true
  processAgent:
    enabled: true
    processCollection: true
  networkMonitoring:
    enabled: true
  serviceMonitoring:
    enabled: true
clusterAgent:
  enabled: true
  metricsProvider:
    enabled: true

# prometheus.yml
global:
  scrape_interval: 15s
  evaluation_interval: 15s

remote_write:
  - url: https://prometheus-prod-01-prod-ap-northeast-1.grafana.net/api/prom/push
    basic_auth:
      username: <GRAFANA_CLOUD_USER>
      password: <GRAFANA_CLOUD_API_KEY>

scrape_configs:
  - job_name: 'kubernetes-pods'
    kubernetes_sd_configs:
      - role: pod
    relabel_configs:
      - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape]
        action: keep
        regex: true

# Grafana Alloy config for Loki
loki.source.kubernetes "pods" {
  targets    = discovery.kubernetes.pods.targets
  forward_to = [loki.write.grafana_cloud.receiver]
}

loki.write "grafana_cloud" {
  endpoint {
    url = "https://logs-prod-ap-northeast-1.grafana.net/loki/api/v1/push"
    basic_auth {
      username = env("GRAFANA_CLOUD_USER")
      password = env("GRAFANA_CLOUD_API_KEY")
    }
  }
}

-- サービスごとのエラーレート
SELECT percentage(count(*), WHERE error IS true)
FROM Transaction
FACET appName
SINCE 1 hour ago
TIMESERIES 5 minutes

-- P99レイテンシの推移
SELECT percentile(duration, 99) as 'P99 Latency'
FROM Transaction
WHERE appName = 'production-api'
SINCE 24 hours ago
TIMESERIES 15 minutes

-- デプロイメント前後の比較
SELECT average(duration), count(*)
FROM Transaction
WHERE appName = 'production-api'
SINCE 1 day ago
COMPARE WITH 1 week ago
TIMESERIES

# Python + OpenTelemetry + New Relic
from opentelemetry import trace
from opentelemetry.sdk.trace import TracerProvider
from opentelemetry.sdk.trace.export import BatchSpanProcessor
from opentelemetry.exporter.otlp.proto.grpc.trace_exporter import OTLPSpanExporter

# New Relic OTLP endpoint
exporter = OTLPSpanExporter(
    endpoint="https://otlp.nr-data.net:4317",
    headers={"api-key": "<NEW_RELIC_LICENSE_KEY>"}
)

provider = TracerProvider()
processor = BatchSpanProcessor(exporter)
provider.add_span_processor(processor)
trace.set_tracer_provider(provider)

tracer = trace.get_tracer(__name__)

@tracer.start_as_current_span("process_order")
def process_order(order_id: str):
    span = trace.get_current_span()
    span.set_attribute("order.id", order_id)
    # ビジネスロジック
    validate_order(order_id)
    charge_payment(order_id)
    return {"status": "completed"}

# otel-collector-config.yaml
receivers:
  otlp:
    protocols:
      grpc:
        endpoint: 0.0.0.0:4317
      http:
        endpoint: 0.0.0.0:4318

processors:
  batch:
    timeout: 5s
    send_batch_size: 1024
  memory_limiter:
    check_interval: 5s
    limit_mib: 512
  attributes:
    actions:
      - key: environment
        value: production
        action: upsert

exporters:
  # Datadog
  datadog:
    api:
      key: ${DD_API_KEY}
  # Grafana Cloud (OTLP)
  otlphttp/grafana:
    endpoint: https://otlp-gateway-prod-ap-northeast-1.grafana.net/otlp
    headers:
      Authorization: "Basic ${GRAFANA_CLOUD_TOKEN}"
  # New Relic
  otlp/newrelic:
    endpoint: https://otlp.nr-data.net:4317
    headers:
      api-key: ${NEW_RELIC_LICENSE_KEY}

service:
  pipelines:
    traces:
      receivers: [otlp]
      processors: [memory_limiter, batch, attributes]
      exporters: [datadog]  # 切り替え可能
    metrics:
      receivers: [otlp]
      processors: [memory_limiter, batch]
      exporters: [datadog]
    logs:
      receivers: [otlp]
      processors: [memory_limiter, batch]
      exporters: [datadog]