Metrics Reference

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Overview

This section provides a complete reference of all available metrics, along with a concise description of what each metric represents. These metrics expose operational, performance, traffic, and system-level insights and can be used for monitoring, analytics, and alerting. These metrics are available per listener or backend or both as applicable. The metrics are exposed in prometheus format and support scraping.

Metrics

This table provides a complete and structured reference for all supported metrics. These metrics can be used to monitor performance, diagnose issues, analyze traffic patterns, and ensure operational visibility across the platform.

Metric	Description
c_status	Current operational status
c_uweight	User-defined backend/server weight
c_weight	Effective backend/server weight
n_active	Number of active entities
n_active_peers	Number of active peers
n_agg_chk_status	Aggregated health check status
n_agg_server_chk_status	Aggregated server health check result
n_agg_server_status	Aggregated server state
n_backup	Backup role indicator
n_busy_polling_enabled	Busy polling enabled status
n_bytes_out_rate	Outgoing bytes per second
n_bytes_out_total	Total bytes sent
n_cache_check	Cache check operations
n_cache_hit	Cache hit count
n_chk_change_sec	Seconds since last health state change
n_chk_down	Health check down count
n_chk_fail	Health check failure count
n_comp_bypass	Compression bypass count
n_compress_resp	Compressed HTTP responses
n_compress_rx	Compressed bytes received
n_compress_tx	Compressed bytes transmitted
n_conn_attempts	Connection attempts
n_conn_check	Connection check count
n_conn_drop	Dropped connections
n_conn_err	Connection errors
n_conn_idle	Idle connections
n_conn_idle_limit	Idle connection limit
n_conn_need	Required connections
n_conn_rate	Connection rate
n_conn_reuses	Reused connections
n_conn_safe_idle	Safely reusable idle connections
n_conn_total	Total connections
n_conn_unsafe_idle	Unsafe idle connections
n_conn_used	Connections in use
n_connect_time_sec	Connection establishment time
n_connected_peers	Connected peers
n_connections_total	Lifetime connection count
n_current_backend_ssl_key_rate	Current backend SSL key rate
n_current_connection_rate	Current connection rate
n_current_connections	Current connections
n_current_frontend_ssl_key_rate	Current frontend SSL key rate
n_current_run_queue	Current run queue size
n_current_session_rate	Current session rate
n_current_ssl_connections	Current SSL connections
n_current_ssl_rate	SSL handshake rate
n_current_tasks	Active tasks
n_current_zlib_memory	Current zlib memory usage
n_downtime_sec	Downtime duration
n_dropped_logs_total	Dropped log entries
n_failed_header_rewriting	Failed header rewrites
n_failed_resolutions	Failed resolutions
n_frontend_ssl_reuse	SSL session reuse
n_hard_max_connections	Hard maximum connections
n_http_comp_bytes_in_total	Total HTTP compressed bytes received
n_http_comp_bytes_out_total	Total HTTP compressed bytes sent
n_http_resp_1xx	HTTP 1xx responses
n_http_resp_2xx	HTTP 2xx responses
n_http_resp_3xx	HTTP 3xx responses
n_http_resp_4xx	HTTP 4xx responses
n_http_resp_5xx	HTTP 5xx responses
n_http_resp_nxx	Non-standard HTTP responses
n_idle_time_percent	CPU idle percentage
n_internal_err	Internal errors
n_jobs	Background jobs
n_last_session_sec	Seconds since last session
n_lb	Load balancing algorithm
n_limit_connection_rate	Connection rate limit
n_limit_http_comp	HTTP compression limit
n_limit_session_rate	Session rate limit
n_limit_sessions	Session limit
n_limit_ssl_rate	SSL rate limit
n_listeners	Number of listeners
n_max_backend_ssl_key_rate	Maximum backend SSL key rate
n_max_connect_time_sec	Maximum connection time
n_max_connection_rate	Maximum connection rate
n_max_connections	Maximum connections
n_max_fds	Maximum file descriptors
n_max_frontend_ssl_key_rate	Maximum frontend SSL key rate
n_max_memory_bytes	Maximum memory usage
n_max_pipes	Maximum pipes
n_max_queue	Maximum queue size
n_max_queue_time_sec	Maximum queue time
n_max_response_time_sec	Maximum response time
n_max_session_rate	Maximum session rate
n_max_sessions	Maximum sessions
n_max_sockets	Maximum sockets
n_max_ssl_connections	Maximum SSL connections
n_max_ssl_rate	Maximum SSL rate
n_max_total_time_sec	Maximum total processing time
n_max_zlib_memory	Maximum zlib memory usage
n_pipes_free_total	Free pipe resources
n_pipes_used_total	Pipes currently used
n_pool_allocated_bytes	Pool allocated bytes
n_pool_failures_total	Pool allocation failures
n_pool_used_bytes	Pool used bytes
n_procs	Process count
n_queue	Current queue size
n_queue_limit	Queue limit
n_queue_time_sec	Queue wait time
n_recv_logs_total	Received log entries
n_redispatch_warn	Redispatch warnings
n_req	Total requests
n_req_cli_abort	Client-aborted requests
n_req_drop	Dropped requests
n_req_err	Request errors
n_req_rate	Request rate
n_req_srv_abort	Server-aborted requests
n_requests_total	Total requests processed
n_resp_drop	Dropped responses
n_resp_err	Response errors
n_response_time_sec	Response time
n_retry_warn	Retry warnings
n_rx_bytes	Bytes received
n_sess_drop	Dropped sessions
n_session_rate	Session rate
n_sessions	Current sessions
n_spliced_bytes_out_total	Zero-copy bytes transmitted
n_ssl_cache_lookups_total	SSL cache lookups
n_ssl_cache_misses_total	SSL cache misses
n_ssl_connections_total	Total SSL connections
n_start_time_sec	Time since process start
n_stopping	Shutdown in progress
n_threads	Thread count
n_throttle	Throttling events
n_total_time_sec	Total processing time
n_tx_bytes	Bytes transmitted
n_unstoppable_jobs	Uninterruptible jobs
n_uptime_sec	Uptime duration
reqsize	Request size
ressize	Response size
scrape_duration_seconds	Scrape duration
scrape_response_size_bytes	Scrape response size
scrape_samples_post_metric_relabeling	Samples after relabeling
scrape_samples_scraped	Samples scraped
scrape_series_added	New series added
scrape_timeout_seconds	Scrape timeout
total_sessions	Total sessions handled
up	Target availability status