Request-level metrics

Not currently exposed in the JSON but captured by the agent is the timestamp and duration of all JS execution (eval, function calls, etc) for each Javascript request.

Request Details

• method - HTTP method (GET, POST, etc)
• full_url - Full URL for the request
• host - Hostname for the request
• url - Path of the request
• is_secure - 1 for https, 0 for http
• responseCode - Response code
• ip_addr - Server IP address
• server_port - TCP server port connected to for the connection
• client_port - TCP port on the client used for the connection (to aid in tcpdump inspection)
• cdn_provider - Detected CDN for the origin
• documentURL - URL of the Document context that originated the request (iFrames, service worker, etc)
• frame_id - Frame ID that the request belongs to
• is_base_page - true if this is in the chain of requests for the base page
• final_base_page - true if this is the final base page request
• initiator - Initiator URL for what triggered the request
• initiator_line - Line of code in the initiator file that triggered the request
• initiator_column - Column of the row in the initiator file
• initiator_type - Initiator type
• priority - Networking stack priority associated with the request when it was first sent (does not include reprioritizations)
• initial_priority - Renderer priority associated with the request when it was first sent (does not include reprioritizations)
• id - Unique Request ID within this page data
• index - Ordered index of this request (0+)
• number - Ordered index of this request (1+)
• raw_id - Unprocessed request ID
• request_id - Processed Request ID
• server_rtt - Estimated RTT to the server for this request
• socket - Connection ID that was used for this request

Request Timings

-1 (or missing) indicates a timing is N/A

• created - Timestamp when the browser first created the request
• all_start - Timestamp of the start of the request
• all_end - Timestamp of the end of the request
• all_ms - Full duration of the request
• dns_start - Timestamp of the start of the DNS lookup
• dns_end - Timestamp of the end of the DNS lookup
• dns_ms - Duration of the DNS lookup
• connect_start - Timestamp of the start of the socket connect
• connect_end - Timestamp of the end of the socket connect
• connect_ms - Duration of the socket connect
• ssl_start - Timestamp of the start of TLS negotiation
• ssl_end - Timestamp of the end of TLS negotiation
• ssl_ms - Duration of the TLS negotiation
• ttfb_start - Timestamp of when the request was sent
• ttfb_end - Timestamp of the first byte of the response
• ttfb_ms - Duration of the first byte
• load_start - Timestamp of the start of the request
• load_start_float - Timestamp of the start of the request (with microseconds - for sorting)
• load_end - Timestamp of the end of the request
• load_ms - Duration of the request/response
• download_start - Timestamp of the start of the response
• download_end - Timestamp of the end of the response
• download_ms - Duration to receive the response

Request Stats

• bytesIn - Size of the response data
• bytesOut - Size of the request data
• objectSize - Wire size of the response object
• objectSizeUncompressed - Uncompressed size of the response object

Headers

• headers - Raw request and response headers
• cacheControl - Response cache-control header value
• cache_time - Calculated cache time (if any)
• contentEncoding - Response content-encoding header value
• contentType - Response content-type header value
• expires - Response expires header value

Protocol Information

• protocol - Protocol used
• http2_stream_id - HTTP/2 Stream ID
• http2_stream_dependency - HTTP/2 Stream Dependency
• http2_stream_exclusive - HTTP/2 stream exclusive flag
• http2_stream_weight - HTTP/2 stream weight
• certificates - Raw certificates received from server during TLS negotiation
• http2_server_settings - List of server-specified HTTP/2 options (concurrent stream count)
• securityDetails - Details about the TLS negotiation (TLS protocol, SAN list, Ciphers, certificate details)
• tls_cipher_suite - Negotiated TLS cipher suite
• tls_next_proto - Advertised next-protocol
• tls_resumed - If a TLS session was resumed
• tls_version - TLS version used

Javascript/CPU details

• cpu.* - Time spent on the main thread for each category of dev tools event
• cpuTimes - Time spent on the main thread for each category of dev tools event

Optimization Checks

-1 designates N/A

• score_cache - Score for caching of static content (0-100)
• score_cdn - Score for using a CDN for static content (0-100)
• score_compress - Score for properly compressing a JPEG image (0-100)
• image_save - Bytes saved by properly compressing this lossy image
• image_total - Original image size
• score_gzip - Score for properly compressing this text resource (0-100)
• gzip_save - Bytes saved by properly compressing this text response
• gzip_total - Original wire-size of the response
• score_keep-alive - Score for properly using keep-alive on the connection that served this response
• score_etags - (deprecated)
• score_cookies - (deprecated)
• score_combine - (deprecated)
• score_minify - (deprecated)
• minify_save - (deprecated)
• minify_total - (deprecated)

Misc

• chunks - Time and size of each data chunk received
• font_details - Decoded details of font files (details of all of the tables)
• jpeg_scan_count - Number of scans for JPEG images