Release 2.1.0 - 2023/06/15

	* Add `initialized` and `initlabels` parameters to `<metric>` element
	* in_prometheus_tail_monitor: Add file open/closed/rotation metrics

Release 2.0.3 - 2022/05/06

	* in_prometheus_output_monitor: Fix a bug where output_status_num_errors metric is missing

Release 2.0.2 - 2021/08/02

	* in_prometheus_output_monitor: Follow Fluentd's core metrics mechanism

Release 2.0.1 - 2021/04/08

	* out_prometheus: Allow for lookup by symbol as well as string

Release 2.0.0 - 2021/02/18

	* Update prometheus-client dependency to 2.1.0 or later

Release 1.8.5 - 2020/11/24

	* in_prometheus_monitor: Support USR2 reload

Release 1.8.4 - 2020/09/24

	* in_prometheus_output_monitor: Add gauge_all parameter

Release 1.8.3 - 2020/08/24

	* Fix resourcr leak in async-http based server

Release 1.8.2 - 2020/07/17

	* in_prometheus_output_monitor/in_prometheus_tail_monitor: Support USR2 reload

Release 1.8.1 - 2020/07/06

	* Fix aggregate bug with async-http

Release 1.8.0 - 2020/04/17

	* Use http_server helper
	* Require fluentd v1.9.1 or later


For older releases, see commits on github repository.
