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Prometheus Text Exposition

Expose counters and histograms in the Prometheus text exposition format with metric metadata and correct escaping.

PythonResilience

Code

snippet
from collections import defaultdict
from typing import Iterable

def escape_label_value(value: str) -> str:
    return value.replace('\\', '\\\\').replace('\n', '\\n').replace('"', '\\"')

def exposition(counters: dict[tuple[str, tuple[tuple[str, str], ...]], float]) -> str:
    lines: list[str] = []
    seen = set()
    for (name, labels), value in sorted(counters.items()):
        if name not in seen:
            lines.append(f'# HELP {name} Application counter.')
            lines.append(f'# TYPE {name} counter')
            seen.add(name)
        rendered = ','.join(f'{k}="{escape_label_value(v)}"' for k, v in labels)
        lines.append(f'{name}{{{rendered}}} {value}')
    return '\n'.join(lines) + '\n'

def record(counters, name: str, value: float, **labels: str) -> None:
    key = (name, tuple(sorted(labels.items())))
    counters[key] += value

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