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23 changes: 13 additions & 10 deletions docs/configuration/http_conn_man/access_log.rst
Original file line number Diff line number Diff line change
Expand Up @@ -65,20 +65,23 @@ entry. The following command operators are supported:
Body bytes sent.

%DURATION%
Total duration in milliseconds of the request from the start time to the last byte out.
Total duration in milliseconds of the request from the start time to the last byte out. df

%FAILURE_REASON%
Additional failure reason if any in addition to response code. Possible values are:

* **LH**: Local health check failed.
* **UH**: No healthy upstream.
* **UT**: Upstream request timeout.
* **LR**: Connection local reset.
* **UR**: Upstream remote reset.
* **UF**: Upstream connection failure.
* **UC**: Upstream connection termination.
* **UO**: Upstream overflow (circuit breaking).
* **NR**: No route configured for a given request.
* **LH**: Local service failed :ref:`health check request <arch_overview_health_checking>`
in addition to 503 response code.
* **UH**: No healthy upstream hosts in upstream cluster in addition to 503 response code.
* **UT**: Upstream request timeout in addition to 504 response code.
* **LR**: Connection local reset in addition to 503 response code.
* **UR**: Upstream remote reset in addition to 503 response code.
* **UF**: Upstream connection failure in addition to 503 response code.
* **UC**: Upstream connection termination in addition to 503 response code.
* **UO**: Upstream overflow (circuit breaking) in addition to 503 response code.
Envoy performed :ref:`circuit breaking <arch_overview_circuit_break>`.
* **NR**: No :ref:`route configured <arch_overview_http_routing>` for a given request
in addition to 404 response code.

%UPSTREAM_HOST%
Upstream host URL (e.g., tcp://ip:port for TCP connections).
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