Instead of requiring one big buffer for formatting the output,
have a walk function that can be used to generate output by
one metric at a time.
Signed-off-by: Jukka Rissanen <jukka.rissanen@nordicsemi.no>
Add collector parameter to metric creation macros so that it
is possible to bind the metric to collector already at built
time.
Also add optional user_data to metric macro calls so that user
can add optional data there. This will be used by network statistics
Prometheus support in subsequent commits.
Signed-off-by: Jukka Rissanen <jukka.rissanen@nordicsemi.no>
Embed "struct prometheus_metric" to individual metric like
counter, gauge, histogram and summary. This way we avoid having
a separate base pointer in specific metrict struct. We also do
not need to search the specific metric from base metric as
we can simply use CONTAINER_OF() macro to get the base metric.
This embedding means that the counter, gauge, histogram and summary
metric define macros are changed as user does not need to create a
separate "struct prometheus_metric".
Convert the tests and sample to use the new macros.
Remove also the static from metric creation macros so that user
can decide whether it needs collector to be static or not.
Signed-off-by: Jukka Rissanen <jukka.rissanen@nordicsemi.no>
This is similar function as add, but will add the difference of
previous value and the new one. This can be used if we want to
periodically update the value with a new one but don't want to
keep track of the old one.
Signed-off-by: Jukka Rissanen <jukka.rissanen@nordicsemi.no>
The library provides Prometheus metrics
types, collector and exposion formatter.
The library isn't thread-safe for now.
The next first pull request will support
that. Can be use exposion formatted
output with Zephyr Http server.
Signed-off-by: Mustafa Abdullah Kus <mustafa.kus@sparsetechnology.com>
