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Fix prometheus metric name and unit conversion (#3924)
* Fix prometheus metric name and unit conversion * Apply suggestions from code review Co-authored-by: Diego Hurtado <[email protected]> * Make annotation parsing more permissive, add test case for consecutive underscores * Add test case for metric name already containing the unit * simplify and speed up regex and update TODO * Add OTEL_PYTHON_EXPERIMENTAL_DISABLE_PROMETHEUS_UNIT_NORMALIZATION opt-out mechanism * Fix RST typo --------- Co-authored-by: Diego Hurtado <[email protected]>
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exporter/opentelemetry-exporter-prometheus/src/opentelemetry/exporter/prometheus/_mapping.py
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| # Copyright The OpenTelemetry Authors | ||
| # | ||
| # Licensed under the Apache License, Version 2.0 (the "License"); | ||
| # you may not use this file except in compliance with the License. | ||
| # You may obtain a copy of the License at | ||
| # | ||
| # http://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License. | ||
|
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| from re import UNICODE, compile | ||
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| _SANITIZE_NAME_RE = compile(r"[^a-zA-Z0-9:]+", UNICODE) | ||
| # Same as name, but doesn't allow ":" | ||
| _SANITIZE_ATTRIBUTE_KEY_RE = compile(r"[^a-zA-Z0-9]+", UNICODE) | ||
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| # UCUM style annotations which are text enclosed in curly braces https://ucum.org/ucum#para-6. | ||
| # This regex is more permissive than UCUM allows and matches any character within curly braces. | ||
| _UNIT_ANNOTATION = compile(r"{.*}") | ||
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| # Remaps common UCUM and SI units to prometheus conventions. Copied from | ||
| # https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/v0.101.0/pkg/translator/prometheus/normalize_name.go#L19 | ||
| # See specification: | ||
| # https://github.com/open-telemetry/opentelemetry-specification/blob/v1.33.0/specification/compatibility/prometheus_and_openmetrics.md#metric-metadata-1 | ||
| _UNIT_MAPPINGS = { | ||
| # Time | ||
| "d": "days", | ||
| "h": "hours", | ||
| "min": "minutes", | ||
| "s": "seconds", | ||
| "ms": "milliseconds", | ||
| "us": "microseconds", | ||
| "ns": "nanoseconds", | ||
| # Bytes | ||
| "By": "bytes", | ||
| "KiBy": "kibibytes", | ||
| "MiBy": "mebibytes", | ||
| "GiBy": "gibibytes", | ||
| "TiBy": "tibibytes", | ||
| "KBy": "kilobytes", | ||
| "MBy": "megabytes", | ||
| "GBy": "gigabytes", | ||
| "TBy": "terabytes", | ||
| # SI | ||
| "m": "meters", | ||
| "V": "volts", | ||
| "A": "amperes", | ||
| "J": "joules", | ||
| "W": "watts", | ||
| "g": "grams", | ||
| # Misc | ||
| "Cel": "celsius", | ||
| "Hz": "hertz", | ||
| # TODO(https://github.com/open-telemetry/opentelemetry-specification/issues/4058): the | ||
| # specification says to normalize "1" to ratio but that may change. Update this mapping or | ||
| # remove TODO once a decision is made. | ||
| "1": "", | ||
| "%": "percent", | ||
| } | ||
| # Similar to _UNIT_MAPPINGS, but for "per" unit denominator. | ||
| # Example: s => per second (singular) | ||
| # Copied from https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/80317ce83ed87a2dff0c316bb939afbfaa823d5e/pkg/translator/prometheus/normalize_name.go#L58 | ||
| _PER_UNIT_MAPPINGS = { | ||
| "s": "second", | ||
| "m": "minute", | ||
| "h": "hour", | ||
| "d": "day", | ||
| "w": "week", | ||
| "mo": "month", | ||
| "y": "year", | ||
| } | ||
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| def sanitize_full_name(name: str) -> str: | ||
| """sanitize the given metric name according to Prometheus rule, including sanitizing | ||
| leading digits | ||
| https://github.com/open-telemetry/opentelemetry-specification/blob/v1.33.0/specification/compatibility/prometheus_and_openmetrics.md#metric-metadata-1 | ||
| """ | ||
| # Leading number special case | ||
| if name and name[0].isdigit(): | ||
| name = "_" + name[1:] | ||
| return _sanitize_name(name) | ||
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| def _sanitize_name(name: str) -> str: | ||
| """sanitize the given metric name according to Prometheus rule, but does not handle | ||
| sanitizing a leading digit.""" | ||
| return _SANITIZE_NAME_RE.sub("_", name) | ||
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| def sanitize_attribute(key: str) -> str: | ||
| """sanitize the given metric attribute key according to Prometheus rule. | ||
| https://github.com/open-telemetry/opentelemetry-specification/blob/v1.33.0/specification/compatibility/prometheus_and_openmetrics.md#metric-attributes | ||
| """ | ||
| # Leading number special case | ||
| if key and key[0].isdigit(): | ||
| key = "_" + key[1:] | ||
| return _SANITIZE_ATTRIBUTE_KEY_RE.sub("_", key) | ||
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| def map_unit(unit: str) -> str: | ||
| """Maps unit to common prometheus metric names if available and sanitizes any invalid | ||
| characters | ||
| See: | ||
| - https://github.com/open-telemetry/opentelemetry-specification/blob/v1.33.0/specification/compatibility/prometheus_and_openmetrics.md#metric-metadata-1 | ||
| - https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/v0.101.0/pkg/translator/prometheus/normalize_name.go#L108 | ||
| """ | ||
| # remove curly brace unit annotations | ||
| unit = _UNIT_ANNOTATION.sub("", unit) | ||
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| if unit in _UNIT_MAPPINGS: | ||
| return _UNIT_MAPPINGS[unit] | ||
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| # replace "/" with "per" units like m/s -> meters_per_second | ||
| ratio_unit_subparts = unit.split("/", maxsplit=1) | ||
| if len(ratio_unit_subparts) == 2: | ||
| bottom = _sanitize_name(ratio_unit_subparts[1]) | ||
| if bottom: | ||
| top = _sanitize_name(ratio_unit_subparts[0]) | ||
| top = _UNIT_MAPPINGS.get(top, top) | ||
| bottom = _PER_UNIT_MAPPINGS.get(bottom, bottom) | ||
| return f"{top}_per_{bottom}" if top else f"per_{bottom}" | ||
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| return ( | ||
| # since units end up as a metric name suffix, they must be sanitized | ||
| _sanitize_name(unit) | ||
| # strip surrounding "_" chars since it will lead to consecutive underscores in the | ||
| # metric name | ||
| .strip("_") | ||
| ) |
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