PromQL Label Name Sanitization From: https://prometheus.io/docs/concepts/data_model/#metric-names-and-labels First character: Match if it's NOT A-z or underscore [^A-z_] All others: Match if they're NOT alphanumeric or underscore [\w_]+?.

PromQL Metric Name Sanitization https://prometheus.io/docs/concepts/data_model/#metric-names-and-labels First character: Match if it's NOT A-z, underscore, or colon [^A-z_:] All others: Match if they're NOT alphanumeric, underscore, or colon [\w_:]+?.