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Listener
Every listener has a statistics tree rooted at listener.<address>. with the following statistics:
Name | Type | Description |
|---|---|---|
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_pre_cx_timeout | Counter | Sockets that timed out during listener filter processing |
downstream_pre_cx_active | Gauge | Sockets currently undergoing listener filter processing |
no_filter_chain_match | Counter | Total connections that didn’t match any filter chain |
ssl.connection_error | Counter | Total TLS connection errors not including failed certificate verifications |
ssl.handshake | Counter | Total successful TLS connection handshakes |
ssl.session_reused | Counter | Total successful TLS session resumptions |
ssl.no_certificate | Counter | Total successful TLS connections with no client certificate |
ssl.fail_verify_no_cert | Counter | Total TLS connections that failed because of missing client certificate |
ssl.fail_verify_error | Counter | Total TLS connections that failed CA verification |
ssl.fail_verify_san | Counter | Total TLS connections that failed SAN verification |
ssl.fail_verify_cert_hash | Counter | Total TLS connections that failed certificate pinning verification |
ssl.ciphers.<cipher> | Counter | Total successful TLS connections that used cipher <cipher> |
ssl.curves.<curve> | Counter | Total successful TLS connections that used ECDHE curve <curve> |
ssl.sigalgs.<sigalg> | Counter | Total successful TLS connections that used signature algorithm <sigalg> |
ssl.versions.<version> | Counter | Total successful TLS connections that used protocol version <version> |
Per-handler Listener Stats
Every listener additionally has a statistics tree rooted at listener.<address>.<handler>. which contains per-handler statistics. As described in the 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 --concurrency option. Along these lines, <handler> 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.
Name | Type | Description |
|---|---|---|
downstream_cx_total | Counter | Total connections on this handler. |
downstream_cx_active | Gauge | Total active connections on this handler. |
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 _.
Name | Type | Description |
|---|---|---|
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 |
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. |
