.. _config_listener_stats: Statistics ========== Listener -------- Every listener has a statistics tree rooted at *listener.
.* (or *listener..* if :ref:`stat_prefix ` is non-empty) with the following statistics: .. csv-table:: :header: Name, Type, Description :widths: 1, 1, 2 downstream_cx_total, Counter, Total connections downstream_cx_destroy, Counter, Total destroyed connections downstream_cx_active, Gauge, Total active connections downstream_cx_length_ms, Histogram, Connection length milliseconds downstream_cx_transport_socket_connect_timeout, Counter, Total connections that timed out during transport socket connection negotiation downstream_cx_overflow, Counter, Total connections rejected due to enforcement of listener connection limit downstream_cx_overload_reject, Counter, Total connections rejected due to configured overload actions downstream_global_cx_overflow, Counter, Total connections rejected due to enforcement of global connection limit downstream_pre_cx_timeout, Counter, Sockets that timed out during listener filter processing downstream_pre_cx_active, Gauge, Sockets currently undergoing listener filter processing global_cx_overflow, Counter, Total connections rejected due to enforcement of the global connection limit no_filter_chain_match, Counter, Total connections that didn't match any filter chain .. _config_listener_stats_tls: TLS statistics -------------- The following TLS statistics are rooted at *listener.
.ssl.*: .. include:: ../../_include/ssl_stats.rst .. _config_listener_stats_tcp: TCP statistics -------------- The following TCP statistics, which are available when using the :ref:`TCP stats transport socket `, are rooted at *listener.
.tcp_stats.*: .. include:: ../../_include/tcp_stats.rst .. _config_listener_stats_udp: UDP statistics -------------- The following UDP statistics are available for UDP listeners and are rooted at *listener.
.udp.*: .. csv-table:: :header: Name, Type, Description :widths: 1, 1, 2 downstream_rx_datagram_dropped, Counter, Number of datagrams dropped due to kernel overflow or truncation .. _config_listener_stats_per_handler: Per-handler Listener Stats -------------------------- Every listener additionally has a statistics tree rooted at *listener.
..* which contains *per-handler* statistics. As described in the :ref:`threading model ` documentation, Envoy has a threading model which includes the *main thread* as well as a number of *worker threads* which are controlled by the :option:`--concurrency` option. Along these lines, ** is equal to *main_thread*, *worker_0*, *worker_1*, etc. These statistics can be used to look for per-handler/worker imbalance on either accepted or active connections. .. csv-table:: :header: Name, Type, Description :widths: 1, 1, 2 downstream_cx_total, Counter, Total connections on this handler. downstream_cx_active, Gauge, Total active connections on this handler. .. _config_listener_manager_stats: Listener manager ---------------- The listener manager has a statistics tree rooted at *listener_manager.* with the following statistics. Any ``:`` character in the stats name is replaced with ``_``. .. csv-table:: :header: Name, Type, Description :widths: 1, 1, 2 listener_added, Counter, Total listeners added (either via static config or LDS). listener_modified, Counter, Total listeners modified (via LDS). listener_removed, Counter, Total listeners removed (via LDS). listener_stopped, Counter, Total listeners stopped. listener_create_success, Counter, Total listener objects successfully added to workers. listener_create_failure, Counter, Total failed listener object additions to workers. listener_in_place_updated, Counter, Total listener objects created to execute filter chain update path. total_filter_chains_draining, Gauge, Number of currently draining filter chains. total_listeners_warming, Gauge, Number of currently warming listeners. total_listeners_active, Gauge, Number of currently active listeners. total_listeners_draining, Gauge, Number of currently draining listeners. workers_started, Gauge, A boolean (1 if started and 0 otherwise) that indicates whether listeners have been initialized on workers.