docs: document oauth2.user_agent for OAuth2 token requests

Signed-off-by: rja5 <rallen99@gmail.com>

Author: rja5

administration/configuring-fluent-bit/yaml/pipeline-section.md

@@ -196,6 +196,7 @@ Output plugins that support outgoing `OAuth 2.0` authentication can expose the f
 | `oauth2.refresh_skew_seconds` | Seconds before expiry at which to refresh the access token. | `60` |
 | `oauth2.timeout` | Timeout for token requests. | `0s` |
 | `oauth2.connect_timeout` | Connect timeout for token requests. | `0s` |
+| `oauth2.user_agent` | Optional `User-Agent` header to include on OAuth 2.0 token requests. | _none_ |
 
 ### Example output configuration
 

pipeline/outputs/http.md

@@ -50,6 +50,7 @@ The _HTTP_ output plugin lets you flush your records into an HTTP endpoint. It i
 | `oauth2.scope` | Optional `OAuth 2.0` scope. | _none_ |
 | `oauth2.timeout` | Timeout for `OAuth 2.0` token requests. Defaults to `http.response_timeout` when unset. | `0s` |
 | `oauth2.token_url` | `OAuth 2.0` token endpoint URL. | _none_ |
+| `oauth2.user_agent` | Optional `User-Agent` header value to include in `OAuth 2.0` token requests. If omitted, no `User-Agent` header is sent. | _none_ |
 | `port` | TCP port of the target HTTP Server. | `80` |
 | `proxy` | Specify an HTTP Proxy. The expected format of this value is `http://HOST:PORT`. HTTPS isn't supported. It's recommended to configure the [HTTP proxy environment variables](https://docs.fluentbit.io/manual/administration/http-proxy) instead as they support both HTTP and HTTPS. | _none_ |
 | `uri` | Specify an optional HTTP URI for the target web server. For example, `/somepath`. | _none_ |

pipeline/outputs/opentelemetry.md

@@ -88,6 +88,7 @@ Only HTTP endpoints are supported.
 | `oauth2.scope`                            | Optional `OAuth 2.0` scope.                                                    | _none_ |
 | `oauth2.timeout`                          | Timeout for `OAuth 2.0` token requests.                                        | `0s`   |
 | `oauth2.token_url`                        | `OAuth 2.0` token endpoint URL.                                                | _none_ |
+| `oauth2.user_agent`                       | Optional `User-Agent` header value to include in `OAuth 2.0` token requests. If omitted, no `User-Agent` header is sent. | _none_ |
 | `port`                                    | TCP port of the target HTTP server.                                            | `80`   |
 | `profiles_uri`                            | Specify an optional HTTP URI for the profiles OTel endpoint.                   | `/v1development/profiles`                                                       |
 | `proxy`                                   | Specify an HTTP Proxy. The expected format of this value is `http://host:port`.| _none_ |