Prometheus supports four different metric and label name escaping schemes (see UTF-8 metric and label name escaping schemes):
The default behaviour is to use underscores, which is what #7209 implements:
If no escaping scheme is specified in the Accept header, underscores escaping SHOULD be used.
The default Accept header sent by Prometheus is:
Accept: application/openmetrics-text;version=1.0.0;escaping=allow-utf-8;q=0.5,application/openmetrics-text;version=0.0.1;q=0.4,text/plain;version=1.0.0;escaping=allow-utf-8;q=0.3,text/plain;version=0.0.4;q=0.2,/;q=0.1
As shown above, and because it is listed first, escaping=allow-utf-8 is the preferred scheme to use.
At a minimum we should support escaping=allow-utf-8 when specified by the client with a fallback to escaping=underscores.
Prometheus supports four different metric and label name escaping schemes (see UTF-8 metric and label name escaping schemes):
The default behaviour is to use
underscores, which is what #7209 implements:The default
Acceptheader sent by Prometheus is:As shown above, and because it is listed first,
escaping=allow-utf-8is the preferred scheme to use.At a minimum we should support
escaping=allow-utf-8when specified by the client with a fallback toescaping=underscores.