NAME

Dancer2::Plugin::PrometheusTiny - use Prometheus::Tiny with Dancer2

SYNOPSIS

DESCRIPTION

This plugin integrates Prometheus::Tiny::Shared with your Dancer2 app, providing some default metrics for requests and responses, with the ability to easily add further metrics to your app. A route is added which makes the metrics available via the configured "endpoint".

See Prometheus::Tiny for more details of the kind of metrics supported.

The following metrics are included by default:

http_request_duration_seconds => {
    help => 'Request durations in seconds',
    type => 'histogram',
},
http_request_size_bytes => {
    help    => 'Request sizes in bytes',
    type    => 'histogram',
    buckets => [ 1, 50, 100, 1_000, 50_000, 500_000, 1_000_000 ],
},
http_requests_total => {
    help => 'Total number of http requests processed',
    type => 'counter',
},
http_response_size_bytes => {
    help    => 'Response sizes in bytes',
    type    => 'histogram',
    buckets => [ 1, 50, 100, 1_000, 50_000, 500_000, 1_000_000 ],
}

KEYWORDS

prometheus

get '/some/route' => sub {
    prometheus->inc(...);
}

Returns the Prometheus::Tiny::Shared instance.

CONFIGURATION

Example:

plugins:
  PrometheusTiny:
    endpoint: /prometheus-metrics   # default: /metrics
    filename: /run/d2prometheus     # default: (undef)
    include_default_metrics: 0      # default: 1
    metrics:                        # default: {}
      http_request_count:
        help: HTTP Request count
        type: counter
    

See below for full details of each configuration setting.

endpoint

The endpoint from which metrics are served. Defaults to /metrics.

filename

It is recommended that this is set to a directory on a memory-backed filesystem. See "filename" in Prometheus::Tiny::Shared for details and default value.

include_default_metrics

Defaults to true. If set to false, then the default metrics shown in "DESCRIPTION" will not be added.

metrics

Declares extra metrics to be merged with those included with the plugin. See See "declare" in Prometheus::Tiny for details.

prometheus_tiny_class

Defaults to Prometheus::Tiny::Shared.

WARNING: You should only set this if you are running a single process plack server such as Twiggy, and you don't want to use file-based store for metrics. Setting this to Prometheus::Tiny will mean that metrics are instead stored in memory.

AUTHOR

Peter Mottram (SysPete) <peter@sysnix.com>

CONTRIBUTORS

None yet.

COPYRIGHT

Copyright (c) 2021 the Catalyst::Plugin::PrometheusTiny "AUTHOR" and "CONTRIBUTORS" as listed above.

LICENSE

This library is free software and may be distributed under the same terms as Perl itself.