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[CONFIGURATION] File configuration - prometheus translation (#3715)
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‎CHANGELOG.md‎

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* [CI] Upgrade tools/vcpkg to 2025.09.17
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[#3701](https://github.com/open-telemetry/opentelemetry-cpp/pull/3701)
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* [CONFIGURATION] File configuration - prometheus translation
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[#3715](https://github.com/open-telemetry/opentelemetry-cpp/pull/3715)
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## [1.23 2025-09-25]
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* [CodeHealth] Fix clang-tidy warnings part 6

‎exporters/prometheus/src/prometheus_pull_builder.cc‎

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#include "opentelemetry/exporters/prometheus/exporter_factory.h"
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#include "opentelemetry/exporters/prometheus/exporter_options.h"
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#include "opentelemetry/exporters/prometheus/prometheus_pull_builder.h"
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#include "opentelemetry/sdk/common/global_log_handler.h"
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#include "opentelemetry/sdk/configuration/prometheus_pull_metric_exporter_builder.h"
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#include "opentelemetry/sdk/configuration/prometheus_pull_metric_exporter_configuration.h"
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#include "opentelemetry/sdk/configuration/registry.h"
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#include "opentelemetry/sdk/configuration/translation_strategy.h"
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#include "opentelemetry/sdk/metrics/metric_reader.h"
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#include "opentelemetry/version.h"
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@@ -38,8 +40,36 @@ std::unique_ptr<opentelemetry::sdk::metrics::MetricReader> PrometheusPullBuilder
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options.url = url;
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options.populate_target_info = true;
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options.without_otel_scope = model->without_scope_info;
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options.without_units = model->without_units;
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options.without_type_suffix = model->without_type_suffix;
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switch (model->translation_strategy)
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{
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case sdk::configuration::TranslationStrategy::UnderscoreEscapingWithSuffixes:
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options.without_units = false;
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options.without_type_suffix = false;
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break;
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case sdk::configuration::TranslationStrategy::UnderscoreEscapingWithoutSuffixes:
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options.without_units = true;
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options.without_type_suffix = true;
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break;
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case sdk::configuration::TranslationStrategy::NoUTF8EscapingWithSuffixes:
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// FIXME: no flag to disable UnderscoreEscaping
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OTEL_INTERNAL_LOG_WARN("[Prometheus Exporter] NoUTF8EscapingWithSuffixes not supported");
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options.without_units = false;
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options.without_type_suffix = false;
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break;
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case sdk::configuration::TranslationStrategy::NoTranslation:
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// FIXME: no flag to disable UnderscoreEscaping
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OTEL_INTERNAL_LOG_WARN("[Prometheus Exporter] NoTranslation not supported");
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options.without_units = true;
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options.without_type_suffix = true;
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break;
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}
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if (model->with_resource_constant_labels != nullptr)
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{
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// FIXME: with_resource_constant_labels
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OTEL_INTERNAL_LOG_WARN("[Prometheus Exporter] with_resource_constant_labels not supported");
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}
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return PrometheusExporterFactory::Create(options);
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}

‎functional/configuration/shelltests/kitchen-sink.test‎

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MODEL PARSED
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[WARNING] attribute_limits not supported, ignoring
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[WARNING] IncludeExclude attribute processor not supported, ignoring
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[WARNING] [Prometheus Exporter] with_resource_constant_labels not supported
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[WARNING] metric producer not supported, ignoring
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[WARNING] metric producer not supported, ignoring
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[WARNING] [Periodic Exporting Metric Reader] Invalid configuration: export_timeout_millis_ should be less than export_interval_millis_, using default values

‎functional/configuration/shelltests/prometheus_translation_broken.test‎

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# Copyright The OpenTelemetry Authors
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# SPDX-License-Identifier: Apache-2.0
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$ example_yaml --test --yaml shelltests/prometheus_translation_broken.yaml
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>
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[ERROR] <shelltests/prometheus_translation_broken.yaml>:9[10](164): Illegal TranslationStrategy: broken
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FAILED TO PARSE MODEL
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>= 1

‎functional/configuration/shelltests/prometheus_translation_broken.yaml‎

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# Copyright The OpenTelemetry Authors
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# SPDX-License-Identifier: Apache-2.0
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file_format: "1.0"
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meter_provider:
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readers:
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- pull:
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exporter:
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prometheus/development:
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host: localhost
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port: 9464
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without_scope_info: false
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# Must fail, invalid
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translation_strategy: broken

‎functional/configuration/shelltests/prometheus_translation_no.test‎

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# Copyright The OpenTelemetry Authors
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# SPDX-License-Identifier: Apache-2.0
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$ example_yaml --test --yaml shelltests/prometheus_translation_no.yaml
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>
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MODEL PARSED
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[WARNING] [Prometheus Exporter] NoTranslation not supported
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[WARNING] [Prometheus Exporter] with_resource_constant_labels not supported
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SDK CREATED
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>= 0

‎functional/configuration/shelltests/prometheus_translation_no.yaml‎

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# Copyright The OpenTelemetry Authors
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# SPDX-License-Identifier: Apache-2.0
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file_format: "1.0"
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meter_provider:
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readers:
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- pull:
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exporter:
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prometheus/development:
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host: localhost
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port: 9464
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without_scope_info: false
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translation_strategy: NoTranslation
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with_resource_constant_labels:
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included:
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- "not supported"

‎functional/configuration/shelltests/prometheus_translation_no_utf8.test‎

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# Copyright The OpenTelemetry Authors
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# SPDX-License-Identifier: Apache-2.0
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$ example_yaml --test --yaml shelltests/prometheus_translation_no_utf8.yaml
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>
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MODEL PARSED
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[WARNING] [Prometheus Exporter] NoUTF8EscapingWithSuffixes not supported
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SDK CREATED
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>= 0

‎functional/configuration/shelltests/prometheus_translation_no_utf8.yaml‎

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# Copyright The OpenTelemetry Authors
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# SPDX-License-Identifier: Apache-2.0
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file_format: "1.0"
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meter_provider:
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readers:
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- pull:
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exporter:
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prometheus/development:
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host: localhost
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port: 9464
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without_scope_info: false
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translation_strategy: NoUTF8EscapingWithSuffixes

‎functional/configuration/shelltests/prometheus_translation_with_suffixes.test‎

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# Copyright The OpenTelemetry Authors
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# SPDX-License-Identifier: Apache-2.0
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$ example_yaml --test --yaml shelltests/prometheus_translation_with_suffixes.yaml
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>
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MODEL PARSED
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SDK CREATED
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>= 0

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