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Release 2.3.0 - 2026/09/02
* in_prometheus: Change default bind address to 127.0.0.1. (#258)
This is incompatible behavior change.
* in_prometheus: Do not disclosure error details for client (#259)
* in_prometheus: Add `ignore_error_log_interval` parameter to suppress repeated error logs (#259,#264)
This introduces the log throttling feature.
* filter_prometheus: Do not let placeholders built from records override the tag ones (#262)
* out_prometheus: Fix a bug that a failing record never reached to @ERROR (#263)
* Support `max_series_per_metric` to limit label sets cardinarity. (#265)
* Refuse wrong <initlabels> which cannot fit into `max_series_per_metric` (#266,#267)
This blocks `max_series_per_metric` mis-configuration on startup.
Release 2.2.2 - 2026/03/27
* in_prometheus: fix: Add IPv6 support for bind parameter (#240)
Release 2.2.1 - 2025/03/24
* in_prometheus_tail_monitor: Add throttling metrics as `fluentd_tail_file_throttled`. (GitHub#227)
Release 2.2.0 - 2024/08/02
* in_prometheus: Add gzip support (Add a new parameter `content_encoding gzip`)
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.