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author	Florian Forster <octo@collectd.org>
	Sat, 23 Dec 2023 19:27:44 +0000 (20:27 +0100)
committer	Florian Forster <octo@collectd.org>
	Thu, 28 Dec 2023 19:13:31 +0000 (20:13 +0100)
commit	ab8639d3f31dab81de5da085e3b77fff27cea43f
tree	bd83643d38c2f4bb32a8f06268d6692f9cd6a3ec	tree \| snapshot
parent	ebc1acd2c82eb210f53727d9fe26c9847d2bb8f7	commit \| diff

write_prometheus plugin: Improve label sanitation.

This copies the behavior of the OpenTelemetry Prometheus translator:

1.  Replace all invalid characters with underscores.
2.  If the name starts with a single underscore, add the prefix `key`.
3.  If the name stars with a digit, add the prefix `key_`.

src/write_prometheus.c		diff \| blob \| blame \| history
src/write_prometheus_test.c		diff \| blob \| blame \| history

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