Add server.server_close() call to shutdown example to properly
release the port. Without this call, attempting to restart the
server on the same port results in "Address already in use" error.

Fixes prometheus#1068

Signed-off-by: Varun Chawla <varun_6april@hotmail.com>

Use base64 encoding for grouping key values containing spaces,
similar to how values with slashes are handled. This prevents
spaces from being converted to '+' signs by quote_plus().

Fixes prometheus#1064

Signed-off-by: Varun Chawla <varun_6april@hotmail.com>

* Support MultiProcessCollector in RestrictedRegistry.

This change makes it so that the RestrictedRegistry will always attempt to collect metrics from a collector for which it couldn’t find any metrics name. Although this can be used generally, this is meant to be used with MultiProcessCollector.

This changes the current behavior of the code but should be somehow safe as it enables filtering in case where it was not working previously. If this is an issue, an alternative approach with an explicit flag could be used (set either in the MultiProcessCollector or in the registry).

The intent here is to allow collecting a subset of metrics from production fastapi servers (running in multiprocess mode). So not having to change the library usage in these servers is advantageous to have filtering work out-of-the-box with this change.

Signed-off-by: Mathias Kende <mathias.kende@mistral.ai>

* Make the new support for collectors without names be explicit.

This adds a parameters to the constructor of CollectorRegistry to allow that new behavior rather than make it be the default.

Signed-off-by: Mathias Kende <mathias.kende@mistral.ai>

* Fix comments

Signed-off-by: Mathias Kende <mathias.kende@mistral.ai>

---------

Signed-off-by: Mathias Kende <mathias.kende@mistral.ai>

* docs: add API reference for all metric types

Adds constructor parameter tables, method documentation, and runnable
real-world examples for Counter, Gauge, Histogram, Summary, Info, and
Enum. The _index.md quick-pick table now covers all six types. Also
fixes labels.md which was missing remove(), remove_by_labels(), and
clear() -- the metric pages were already linking to it for those methods.

Closes prometheus#1021

Signed-off-by: k1chik <107162115+k1chik@users.noreply.github.com>

* docs: address review feedback on counter example and table header

Revert quick-start counter example to use 'my_failures' (no _total suffix)
since the library appends it automatically. Rename 'Value goes' column to
'Behavior' in the metric type overview table for clarity across all six types.

Signed-off-by: k1chik <107162115+k1chik@users.noreply.github.com>

* docs: rename table column to 'Update model'

Signed-off-by: k1chik <107162115+k1chik@users.noreply.github.com>

---------

Signed-off-by: k1chik <107162115+k1chik@users.noreply.github.com>

Signed-off-by: Chris Marchbanks <csmarchbanks@gmail.com>

…rometheus#1162)

Closes prometheus#1161

Adds parameter tables and formal API reference sections to three pages
that previously had examples but no parameter documentation.

pushgateway.md: documents push_to_gateway, pushadd_to_gateway,
delete_from_gateway, instance_ip_grouping_key, and all four built-in
handlers (default, basic_auth, tls_auth, passthrough_redirect).

textfile.md: documents write_to_textfile with all four parameters
including the previously undocumented escaping and tmpdir, plus atomic
write semantics and error behavior.

multiprocess/_index.md: documents MultiProcessCollector constructor and
mark_process_dead with parameter tables including the previously
undocumented path parameter on both.

Signed-off-by: k1chik <107162115+k1chik@users.noreply.github.com>

Assigning the .time() context manager (with ... as t) now yields a Timer
whose .duration attribute holds the observed value in seconds after the
block exits. This lets callers reuse the measurement (logging, further
metrics) without calling default_timer() a second time.

Signed-off-by: Lukáš Vokráčko <lukas@vokracko.cz>

…asses (prometheus#1169)

Closes prometheus#1163

collector/custom.md: Collector protocol section (collect/describe), value vs
labels mutual exclusivity note, full constructor and add_metric tables for
GaugeMetricFamily, CounterMetricFamily, SummaryMetricFamily,
HistogramMetricFamily, and InfoMetricFamily, plus a runnable real-world example.

collector/_index.md: constructor parameter tables for ProcessCollector,
PlatformCollector, and GCCollector, with exported metrics listed for each.

registry/_index.md (new): CollectorRegistry constructor and all public methods
(register, unregister, collect, restricted_registry, get_sample_value,
set_target_info, get_target_info), the global REGISTRY instance, and examples
for isolated registry usage and registry=None.

All code examples verified by running them in Python.

Signed-off-by: k1chik <107162115+k1chik@users.noreply.github.com>