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Every connection manager has a statistics tree rooted at http.<stat_prefix>. with the following statistics:
Name | Type | Description |
|---|---|---|
downstream_cx_total | Counter | Total connections |
downstream_cx_ssl_total | Counter | Total TLS connections |
downstream_cx_http1_total | Counter | Total HTTP/1.1 connections |
downstream_cx_upgrades_total | Counter | Total successfully upgraded connections. These are also counted as total http1/http2 connections. |
downstream_cx_http2_total | Counter | Total HTTP/2 connections |
downstream_cx_http3_total | Counter | Total HTTP/3 connections |
downstream_cx_destroy | Counter | Total connections destroyed |
downstream_cx_destroy_remote | Counter | Total connections destroyed due to remote close |
downstream_cx_destroy_local | Counter | Total connections destroyed due to local close |
downstream_cx_destroy_active_rq | Counter | Total connections destroyed with 1+ active request |
downstream_cx_destroy_local_active_rq | Counter | Total connections destroyed locally with 1+ active request |
downstream_cx_destroy_remote_active_rq | Counter | Total connections destroyed remotely with 1+ active request |
downstream_cx_active | Gauge | Total active connections |
downstream_cx_ssl_active | Gauge | Total active TLS connections |
downstream_cx_http1_active | Gauge | Total active HTTP/1.1 connections |
downstream_cx_upgrades_active | Gauge | Total active upgraded connections. These are also counted as active http1/http2 connections. |
downstream_cx_http2_active | Gauge | Total active HTTP/2 connections |
downstream_cx_http3_active | Gauge | Total active HTTP/3 connections |
downstream_cx_protocol_error | Counter | Total protocol errors |
downstream_cx_length_ms | Histogram | Connection length milliseconds |
downstream_cx_rx_bytes_total | Counter | Total bytes received |
downstream_cx_rx_bytes_buffered | Gauge | Total received bytes currently buffered |
downstream_cx_tx_bytes_total | Counter | Total bytes sent |
downstream_cx_tx_bytes_buffered | Gauge | Total sent bytes currently buffered |
downstream_cx_drain_close | Counter | Total connections closed due to draining |
downstream_cx_idle_timeout | Counter | Total connections closed due to idle timeout |
downstream_cx_max_duration_reached | Counter | Total connections closed due to max connection duration |
downstream_cx_max_requests_reached | Counter | Total connections closed due to max requests per connection |
downstream_cx_overload_disable_keepalive | Counter | Total connections for which HTTP 1.x keepalive has been disabled due to Envoy overload |
downstream_flow_control_paused_reading_total | Counter | Total number of times reads were disabled due to flow control |
downstream_flow_control_resumed_reading_total | Counter | Total number of times reads were enabled on the connection due to flow control |
downstream_rq_total | Counter | Total requests |
downstream_rq_http1_total | Counter | Total HTTP/1.1 requests |
downstream_rq_http2_total | Counter | Total HTTP/2 requests |
downstream_rq_http3_total | Counter | Total HTTP/3 requests |
downstream_rq_active | Gauge | Total active requests |
downstream_rq_rejected_via_ip_detection | Counter | Total requests rejected because the original IP detection failed |
downstream_rq_response_before_rq_complete | Counter | Total responses sent before the request was complete |
downstream_rq_rx_reset | Counter | Total request resets received |
downstream_rq_tx_reset | Counter | Total request resets sent |
downstream_rq_non_relative_path | Counter | Total requests with a non-relative HTTP path |
downstream_rq_too_large | Counter | Total requests resulting in a 413 due to buffering an overly large body |
downstream_rq_completed | Counter | Total requests that resulted in a response (e.g. does not include aborted requests) |
downstream_rq_failed_path_normalization | Counter | Total requests redirected due to different original and normalized URL paths or when path normalization failed. This action is configured by setting the path_with_escaped_slashes_action config option. |
downstream_rq_1xx | Counter | Total 1xx responses |
downstream_rq_2xx | Counter | Total 2xx responses |
downstream_rq_3xx | Counter | Total 3xx responses |
downstream_rq_4xx | Counter | Total 4xx responses |
downstream_rq_5xx | Counter | Total 5xx responses |
downstream_rq_ws_on_non_ws_route | Counter | Total upgrade requests rejected by non upgrade routes. This now applies both to WebSocket and non-WebSocket upgrades |
downstream_rq_time | Histogram | Total time for request and response (milliseconds) |
downstream_rq_idle_timeout | Counter | Total requests closed due to idle timeout |
downstream_rq_max_duration_reached | Counter | Total requests closed due to max duration reached |
downstream_rq_timeout | Counter | Total requests closed due to a timeout on the request path |
downstream_rq_overload_close | Counter | Total requests closed due to Envoy overload |
downstream_rq_redirected_with_normalized_path | Counter | Total requests redirected due to different original and normalized URL paths. This action is configured by setting the path_with_escaped_slashes_action config option. |
rs_too_large | Counter | Total response errors due to buffering an overly large body |
Per user agent statistics
Additional per user agent statistics are rooted at http.<stat_prefix>.user_agent.<user_agent>. Currently Envoy matches user agent for both iOS (ios) and Android (android) and produces the following statistics:
Name | Type | Description |
|---|---|---|
downstream_cx_total | Counter | Total connections |
downstream_cx_destroy_remote_active_rq | Counter | Total connections destroyed remotely with 1+ active requests |
downstream_rq_total | Counter | Total requests |
Per listener statistics
Per listener statistics are rooted at listener.<address>.
HTTP per listener statistics
Additional HTTP statistics are of the form http.<stat_prefix>. with the following statistics:
Name | Type | Description |
|---|---|---|
downstream_rq_completed | Counter | Total responses |
downstream_rq_1xx | Counter | Total 1xx responses |
downstream_rq_2xx | Counter | Total 2xx responses |
downstream_rq_3xx | Counter | Total 3xx responses |
downstream_rq_4xx | Counter | Total 4xx responses |
downstream_rq_5xx | Counter | Total 5xx responses |
HTTP/3 per listener statistics
HTTP/3 statistics with the form of http3.downstream.<stat_prefix>.:
Name | Type | Description |
|---|---|---|
<tx/rx>.quicconnection_close_error_code<errorcode> | Counter | A collection of counters that are lazily initialized to record each quic connection close error code that’s present. |
<tx/rx>.quic_reset_stream_error_code<error_code> | Counter | A collection of counters that that lazily initialized to record quic stream reset error codes. |
Per codec statistics
Each codec has the option of adding per-codec statistics. http1, http2, and http3 all have codec stats.
HTTP/1 codec statistics
On the downstream side all http1 statistics are rooted at http1.
On the upstream side all http1 statistics are rooted at cluster.<name>.http1.
Name | Type | Description |
|---|---|---|
dropped_headers_with_underscores | Counter | Total number of dropped headers with names containing underscores. This action is configured by setting the headers_with_underscores_action config setting. |
metadata_not_supported_error | Counter | Total number of metadata dropped during HTTP/1 encoding |
response_flood | Counter | Total number of connections closed due to response flooding |
requests_rejected_with_underscores_in_headers | Counter | Total numbers of rejected requests due to header names containing underscores. This action is configured by setting the headers_with_underscores_action config setting. |
HTTP/2 codec statistics
On the downstream side all http2 statistics are rooted at http2.
On the upstream side all http2 statistics are rooted at cluster.<name>.http2.
Name | Type | Description |
|---|---|---|
dropped_headers_with_underscores | Counter | Total number of dropped headers with names containing underscores. This action is configured by setting the headers_with_underscores_action config setting. |
header_overflow | Counter | Total number of connections reset due to the headers being larger than the configured value. |
headers_cb_no_stream | Counter | Total number of errors where a header callback is called without an associated stream. This tracks an unexpected occurrence due to an as yet undiagnosed bug |
inbound_empty_frames_flood | Counter | Total number of connections terminated for exceeding the limit on consecutive inbound frames with an empty payload and no end stream flag. The limit is configured by setting the max_consecutive_inbound_frames_with_empty_payload config setting. |
inbound_priority_frames_flood | Counter | Total number of connections terminated for exceeding the limit on inbound frames of type PRIORITY. The limit is configured by setting the max_inbound_priority_frames_per_stream config setting. |
inbound_window_update_frames_flood | Counter | Total number of connections terminated for exceeding the limit on inbound frames of type WINDOW_UPDATE. The limit is configured by setting the max_inbound_window_updateframes_per_data_frame_sent config setting. |
metadata_empty_frames | Counter | Total number of metadata frames that were received and contained empty maps. |
outbound_flood | Counter | Total number of connections terminated for exceeding the limit on outbound frames of all types. The limit is configured by setting the max_outbound_frames config setting. |
outbound_control_flood | Counter | Total number of connections terminated for exceeding the limit on outbound frames of types PING, SETTINGS and RST_STREAM. The limit is configured by setting the max_outbound_control_frames config setting. |
requests_rejected_with_underscores_in_headers | Counter | Total numbers of rejected requests due to header names containing underscores. This action is configured by setting the headers_with_underscores_action config setting. |
rx_messaging_error | Counter | Total number of invalid received frames that violated section 8 of the HTTP/2 spec. This will result in a tx_reset |
rx_reset | Counter | Total number of reset stream frames received by Envoy |
stream_refused_errors | Counter | Total number of invalid frames received by Envoy with a REFUSED_STREAM error code |
trailers | Counter | Total number of trailers seen on requests coming from downstream |
tx_flush_timeout | Counter | Total number of stream idle timeouts waiting for open stream window to flush the remainder of a stream |
tx_reset | Counter | Total number of reset stream frames transmitted by Envoy |
keepalive_timeout | Counter | Total number of connections closed due to keepalive timeout |
streams_active | Gauge | Active streams as observed by the codec |
pending_send_bytes | Gauge | Currently buffered body data in bytes waiting to be written when stream/connection window is opened. |
Attention
The HTTP/2 streams_active gauge may be greater than the HTTP connection manager downstream_rq_active gauge due to differences in stream accounting between the codec and the HTTP connection manager.
HTTP/3 codec statistics
On the downstream side all http3 statistics are rooted at http3.
On the upstream side all http3 statistics are rooted at cluster.<name>.http3.
Name | Type | Description |
|---|---|---|
dropped_headers_with_underscores | Counter | Total number of dropped headers with names containing underscores. This action is configured by setting the headers_with_underscores_action config setting. |
requests_rejected_with_underscores_in_headers | Counter | Total numbers of rejected requests due to header names containing underscores. This action is configured by setting the headers_with_underscores_action config setting. |
rx_reset | Counter | Total number of reset stream frames received by Envoy |
tx_reset | Counter | Total number of reset stream frames transmitted by Envoy |
metadata_not_supported_error | Counter | Total number of metadata dropped during HTTP/3 encoding |
quic_version_rfc_v1 | Counter | Total number of quic connections that use transport version rfc-v1. |
Tracing statistics
Tracing statistics are emitted when tracing decisions are made. All tracing statistics are rooted at http.<stat_prefix>.tracing. with the following statistics:
Name | Type | Description |
|---|---|---|
random_sampling | Counter | Total number of traceable decisions by random sampling |
service_forced | Counter | Total number of traceable decisions by server runtime flag tracing.global_enabled |
client_enabled | Counter | Total number of traceable decisions by request header x-envoy-force-trace |
not_traceable | Counter | Total number of non-traceable decisions by request id |
health_check | Counter | Total number of non-traceable decisions by health check |
