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TCP proxy architecture overview
This filter should be configured with the name envoy.tcp_proxy.
Dynamic cluster selection
The upstream cluster used by the TCP proxy filter can be dynamically set by other network filters on a per-connection basis by setting a per-connection state object under the key envoy.tcp_proxy.cluster. See the implementation for the details.
Statistics
The TCP proxy filter emits both its own downstream statistics as well as many of the cluster upstream statistics where applicable. The downstream statistics are rooted at tcp.
Name | Type | Description |
|---|---|---|
downstream_cx_total | Counter | Total number of connections handled by the filter |
downstream_cx_no_route | Counter | Number of connections for which no matching route was found or the cluster for the route was not found |
downstream_cx_tx_bytes_total | Counter | Total bytes written to the downstream connection |
downstream_cx_tx_bytes_buffered | Gauge | Total bytes currently buffered to the downstream connection |
downstream_cx_rx_bytes_total | Counter | Total bytes read from the downstream connection |
downstream_cx_rx_bytes_buffered | Gauge | Total bytes currently buffered from the downstream connection |
downstream_flow_control_paused_reading_total | Counter | Total number of times flow control paused reading from downstream |
downstream_flow_control_resumed_reading_total | Counter | Total number of times flow control resumed reading from downstream |
idle_timeout | Counter | Total number of connections closed due to idle timeout |
upstream_flush_total | Counter | Total number of connections that continued to flush upstream data after the downstream connection was closed |
upstream_flush_active | Gauge | Total connections currently continuing to flush upstream data after the downstream connection was closed |
