Files
agentic-dev/docs/library-decisions/2026-05-14-@opentelemetry/sdk-metrics.md
Danijel Martinek 9ff861667a chore(deps): backfill library traces for ADR-017 cluster
Adds approved trace files dated 2026-05-14 for all 13 OpenTelemetry
packages in packages/core-shared and packages/core-audit:

  @opentelemetry/api, api-logs, context-async-hooks,
  instrumentation, instrumentation-http, instrumentation-pg,
  instrumentation-undici, resources, sdk-logs, sdk-metrics,
  sdk-node, sdk-trace-base, semantic-conventions

All files pass validateTrace() from schema.mjs. The @sentry/opentelemetry
bridge was already covered in the ADR-014 cluster commit.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-05-14 10:01:30 +00:00

87 lines
3.5 KiB
Markdown

---
package: "@opentelemetry/sdk-metrics"
version: "^1.27.0"
tier: core
decision: approved
date: 2026-05-14
deciders: [Danijel Martinek]
adr: adr-017
filter-results:
license: Apache-2.0
types: native
maintenance: active
boundary-fit: pass
shadow-check: pass
eu-residency: n/a
cve-scan: clean
named-consumer: pass
verification-commands:
- npm view @opentelemetry/sdk-metrics license
- npm view @opentelemetry/sdk-metrics version
- pnpm audit --audit-level=moderate
accepted-cves: []
---
## Filter: license
<!-- Result: Apache-2.0 -->
`npm view @opentelemetry/sdk-metrics license` returns `Apache-2.0`. Apache-2.0 is on the allowlist.
## Filter: types
<!-- Result: native -->
`@opentelemetry/sdk-metrics` is authored in TypeScript and ships its own `.d.ts` declaration files. No separate `@types/` package is needed.
## Filter: maintenance
<!-- Result: active -->
Actively maintained by the OpenTelemetry community. The 1.27.x line is on the stable 1.x track; the metrics specification is stable within CNCF.
## Filter: boundary-fit
<!-- Result: pass -->
ADR-017 §8 restricts `@opentelemetry/sdk-metrics` to `**/instrumentation/otel/**` and app init paths. `MeterProvider` is configured in `core-shared/instrumentation/otel/init-otel-server-node.ts`. Feature packages use only `@opentelemetry/api`'s `metrics` API (indirectly via `IMetrics`), never the SDK directly.
## Filter: shadow-check
<!-- Result: pass -->
`@opentelemetry/sdk-metrics` is the OTel metrics SDK implementation. No competing metrics SDK is present in the workspace. The `IMetrics` interface (ADR-017 §10) is backed exclusively by this package.
## Filter: eu-residency
<!-- Result: n/a -->
`@opentelemetry/sdk-metrics` is the metrics pipeline infrastructure with no independent data transmission. All metrics are forwarded through the configured exporter. EU residency is governed by the exporter's DSN configuration.
## Filter: cve-scan
<!-- Result: clean -->
`pnpm audit --audit-level=moderate` reports no advisories against `@opentelemetry/sdk-metrics` at the time of this trace.
## Filter: named-consumer
<!-- Result: pass -->
`packages/core-shared/src/instrumentation/otel/init-otel-server-node.ts` instantiates `MeterProvider` and backs the `OtelMetrics` implementation of `IMetrics` (ADR-017 §10). The three `IMetrics` methods (`counter`, `histogram`, `gauge`) map to OTel counter, histogram, and UpDownCounter instruments.
## Prompt: replaces
ADR-014 had no `IMetrics` signal. `@opentelemetry/sdk-metrics` introduces the metrics signal as the SDK backing for the new `IMetrics` interface (ADR-017 §10). It supersedes any ad-hoc counter increment patterns that would otherwise have been added without a unified metrics pipeline.
## Prompt: migration-cost-out
Hard. `@opentelemetry/sdk-metrics` backs the `OtelMetrics` implementation used throughout `core-shared`. Replacing it requires implementing the three `IMetrics` instruments with a different metrics SDK and re-registering with the OTel SDK. The `IMetrics` interface (ADR-017 §10) isolates feature packages from the SDK details.
## Prompt: alternatives-considered
1. **Prometheus client (`prom-client`)** — Popular Node.js metrics library. Rejected in ADR-017: separate pipeline from traces/logs; no automatic span context on metrics; would require a second init path alongside OTel.
2. **Statsd / DogStatsD** — Rejected: requires a separate collector sidecar; UDP-based with no context propagation; vendor-coupling concern for DogStatsD.
See ADR-017 for the full decision rationale.