[mackerelotlpexporter] fix: rename the component and set alias to match naming convention

[Arthur1]

• [Discussion] Establish component naming convention open-telemetry/opentelemetry-collector#14208

https://github.com/open-telemetry/opentelemetry-collector/blob/main/docs/coding-guidelines.md#component-naming

Components (receivers, processors, exporters, extensions, and connectors) MUST use lower_snake_case naming convention. This ensures consistency and enhances readability for end users.

Following this convention, we make our mackerelotlp exporter callable under the type name mackerel_otlp. The old type name mackerelotlp will be retained as an alias and made available for a certain period.

The issue where warning messages appear when using the default settings for the OpenTelemetry Collector Mackerel will be addressed in a separate pull request (#106).

Test

In the default config of the Mackerel OpenTelemetry Collector, legacy component names (used as aliases) are still used, but they continue to work. The only difference is that a warning message is displayed.

$ docker run -e MACKEREL_APIKEY=dummy mackerel/otelcol-mackerel:latest-arm64
2026-01-27T12:43:54.628Z        warn    builders/builders.go:40 "mackerelotlp" alias is deprecated; use "mackerel_otlp" instead {"resource": {"service.instance.id": "4c83c942-49d5-4fad-a5f6-74a1b3c099ee", "service.name": "otelcol-mackerel", "service.version": "0.8.0"}, "otelcol.component.id": "mackerelotlp", "otelcol.component.kind": "exporter", "otelcol.signal": "traces"}
2026-01-27T12:43:54.628Z        info    builders/builders.go:28 Development component. May change in the future.       {"resource": {"service.instance.id": "4c83c942-49d5-4fad-a5f6-74a1b3c099ee", "service.name": "otelcol-mackerel", "service.version": "0.8.0"}, "otelcol.component.id": "mackerelotlp", "otelcol.component.kind": "exporter", "otelcol.signal": "traces"}
2026-01-27T12:43:54.629Z        warn    builders/builders.go:40 "mackerelotlp" alias is deprecated; use "mackerel_otlp" instead {"resource": {"service.instance.id": "4c83c942-49d5-4fad-a5f6-74a1b3c099ee", "service.name": "otelcol-mackerel", "service.version": "0.8.0"}, "otelcol.component.id": "mackerelotlp", "otelcol.component.kind": "exporter", "otelcol.signal": "metrics"}
2026-01-27T12:43:54.629Z        info    builders/builders.go:28 Development component. May change in the future.       {"resource": {"service.instance.id": "4c83c942-49d5-4fad-a5f6-74a1b3c099ee", "service.name": "otelcol-mackerel", "service.version": "0.8.0"}, "otelcol.component.id": "mackerelotlp", "otelcol.component.kind": "exporter", "otelcol.signal": "metrics"}
2026-01-27T12:43:54.630Z        info    service@v0.144.0/service.go:239 Starting otelcol-mackerel...    {"resource": {"service.instance.id": "4c83c942-49d5-4fad-a5f6-74a1b3c099ee", "service.name": "otelcol-mackerel", "service.version": "0.8.0"}, "Version": "0.8.0", "NumCPU": 14}
2026-01-27T12:43:54.630Z        info    extensions/extensions.go:40     Starting extensions...  {"resource": {"service.instance.id": "4c83c942-49d5-4fad-a5f6-74a1b3c099ee", "service.name": "otelcol-mackerel", "service.version": "0.8.0"}}
2026-01-27T12:43:54.630Z        info    internal/resourcedetection.go:160       began detecting resource information   {"resource": {"service.instance.id": "4c83c942-49d5-4fad-a5f6-74a1b3c099ee", "service.name": "otelcol-mackerel", "service.version": "0.8.0"}, "otelcol.component.id": "resourcedetection", "otelcol.component.kind": "processor", "otelcol.pipeline.id": "traces", "otelcol.signal": "traces"}
2026-01-27T12:43:54.631Z        info    internal/resourcedetection.go:217       detected resource information   {"resource": {"service.instance.id": "4c83c942-49d5-4fad-a5f6-74a1b3c099ee", "service.name": "otelcol-mackerel", "service.version": "0.8.0"}, "otelcol.component.id": "resourcedetection", "otelcol.component.kind": "processor", "otelcol.pipeline.id": "traces", "otelcol.signal": "traces", "resource": {"host.name":"f2e8301b21ad","os.type":"linux"}}
2026-01-27T12:43:54.631Z        info    internal/resourcedetection.go:160       began detecting resource information   {"resource": {"service.instance.id": "4c83c942-49d5-4fad-a5f6-74a1b3c099ee", "service.name": "otelcol-mackerel", "service.version": "0.8.0"}, "otelcol.component.id": "resourcedetection", "otelcol.component.kind": "processor", "otelcol.pipeline.id": "traces", "otelcol.signal": "traces"}
2026-01-27T12:43:54.631Z        info    internal/resourcedetection.go:217       detected resource information   {"resource": {"service.instance.id": "4c83c942-49d5-4fad-a5f6-74a1b3c099ee", "service.name": "otelcol-mackerel", "service.version": "0.8.0"}, "otelcol.component.id": "resourcedetection", "otelcol.component.kind": "processor", "otelcol.pipeline.id": "traces", "otelcol.signal": "traces", "resource": {"host.name":"f2e8301b21ad","os.type":"linux"}}
2026-01-27T12:43:54.631Z        info    otlpreceiver@v0.144.0/otlp.go:120       Starting GRPC server    {"resource": {"service.instance.id": "4c83c942-49d5-4fad-a5f6-74a1b3c099ee", "service.name": "otelcol-mackerel", "service.version": "0.8.0"}, "otelcol.component.id": "otlp", "otelcol.component.kind": "receiver", "endpoint": "127.0.0.1:4317"}
2026-01-27T12:43:54.632Z        info    otlpreceiver@v0.144.0/otlp.go:178       Starting HTTP server    {"resource": {"service.instance.id": "4c83c942-49d5-4fad-a5f6-74a1b3c099ee", "service.name": "otelcol-mackerel", "service.version": "0.8.0"}, "otelcol.component.id": "otlp", "otelcol.component.kind": "receiver", "endpoint": "127.0.0.1:4318"}
2026-01-27T12:43:54.632Z        info    service@v0.144.0/service.go:262 Everything is ready. Begin running and processing data. {"resource": {"service.instance.id": "4c83c942-49d5-4fad-a5f6-74a1b3c099ee", "service.name": "otelcol-mackerel", "service.version": "0.8.0"}}

[mrasu]

👍

Good catch!