rel: Prepare the 2.9.4 release (#1514)

## Which problem is this PR solving?

Prepares the next Refinery release.

## Short description of the changes
- Add changelog entry
- Add release notes entry
- Regenerate docs

---------

Co-authored-by: Kent Quirk <kentquirk@honeycomb.io>

Author: MikeGoldsmith

CHANGELOG.md

@@ -1,5 +1,16 @@
 # Refinery Changelog
 
+## 2.9.4 2025-03-25
+
+### Features
+
+- feat: Record the number of bytes per event (#1510) | [Mike Goldsmith](https://github.com/MikeGoldsmith)
+
+### Maintenance
+
+- maint: bump deps (#1511) | [Tyler Helmuth](https://github.com/TylerHelmuth)
+- maint(deps): bump the minor-patch group with 6 updates (#1499) | [Tyler Helmuth](https://github.com/TylerHelmuth)
+
 ## 2.9.3 2025-02-13
 
 ### Fixes

RELEASE_NOTES.md

@@ -2,6 +2,11 @@
 
 While [CHANGELOG.md](./CHANGELOG.md) contains detailed documentation and links to all the source code changes in a given release, this document is intended to be aimed at a more comprehensible version of the contents of the release from the point of view of users of Refinery.
 
+## Version 2.9.4
+
+This is a maintenance release that adds the `incoming_router_event_bytes` and `peer_router_event_bytes` metrics, which use a histogram to record the number of bytes per received event.
+The release also includes dependency updates.
+
 ## Version 2.9.3
 
 This is a bug fix release that includes fixes relating to debugging with otel tracing.

config_complete.yaml

@@ -2,7 +2,7 @@
 ## Honeycomb Refinery Configuration ##
 ######################################
 #
-# created on 2025-02-13 at 16:52:12 UTC from ../../config.yaml using a template generated on 2025-02-13 at 16:52:04 UTC
+# created on 2025-03-25 at 13:08:15 UTC from ../../config.yaml using a template generated on 2025-03-25 at 13:08:03 UTC
 
 # This file contains a configuration for the Honeycomb Refinery. It is in YAML
 # format, organized into named groups, each of which contains a set of
@@ -1198,8 +1198,8 @@ Specialized:
     ##
     ## Eligible for live reload.
     # AdditionalAttributes:
-      #  ClusterName: MyCluster
       #  environment: production
+      #  ClusterName: MyCluster
 
 ###############
 ## ID Fields ##

metrics.md

@@ -1,7 +1,7 @@
 # Honeycomb Refinery Metrics Documentation
 
 This document contains the description of various metrics used in Refinery.
-It was automatically generated on 2025-02-13 at 16:52:11 UTC.
+It was automatically generated on 2025-03-25 at 13:08:14 UTC.
 
 Note: This document does not include metrics defined in the dynsampler-go dependency, as those metrics are generated dynamically at runtime. As a result, certain metrics may be missing or incomplete in this document, but they will still be available during execution with their full names.
 
@@ -97,6 +97,7 @@ Metrics in this table don't contain their expected prefixes. This is because the
 | queue_time | Histogram | Microseconds | The time spent in the queue before being sent to Honeycomb |
 | _router_proxied | Counter | Dimensionless | the number of events proxied to another refinery |
 | _router_event | Counter | Dimensionless | the number of events received |
+| _router_event_bytes | Histogram | Bytes | the number of bytes per event received |
 | _router_span | Counter | Dimensionless | the number of spans received |
 | _router_dropped | Counter | Dimensionless | the number of events dropped because the channel was full |
 | _router_nonspan | Counter | Dimensionless | the number of non-span events received |