Metric names with dots

[faxm0dem]

According to the exposition formats documentation a metric in the following style is valid :

# UTF-8 metric and label names:
{"my.dotted.metric", "error.message"="Not Found"}

However, when using this example with node_exporter and flag -collector.textfile.directory I get the following error message :

failed to collect textfile data" collector=textfile file=test.prom err="failed to parse textfile data from \"textfile_collector/test.prom\": text format parsing error in line 2: invalid metric name \"my.dottedmetric\"

Version information :

node_exporter, version 1.11.1 (branch: HEAD, revision: 0dd664dece3f8319f6bec5a221acd2c7ad13a23d)
  build user:       root@3d8697c83dd8
  build date:       20260407-15:45:19
  go version:       go1.26.1
  platform:         linux/amd64
  tags:             unknown