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synapse-product/docs/usage/administration/request_log.md
Sean Quah b2df0716bc
Improve logging for cancelled requests (#12587) 
Don't log stack traces for cancelled requests and use a custom HTTP
status code of 499.

Signed-off-by: Sean Quah <seanq@element.io>
2022-05-04 13:38:55 +01:00

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Request log format

HTTP request logs are written by synapse (see site.py for details).

See the following for how to decode the dense data available from the default logging configuration.

2020-10-01 12:00:00,000 - synapse.access.http.8008 - 311 - INFO - PUT-1000- 192.168.0.1 - 8008 - {another-matrix-server.com} Processed request: 0.100sec/-0.000sec (0.000sec, 0.000sec) (0.001sec/0.090sec/3) 11B !200 "PUT /_matrix/federation/v1/send/1600000000000 HTTP/1.1" "Synapse/1.20.1" [0 dbevts]
-AAAAAAAAAAAAAAAAAAAAA-   -BBBBBBBBBBBBBBBBBBBBBB-   -C-   -DD-   -EEEEEE-  -FFFFFFFFF-   -GG-    -HHHHHHHHHHHHHHHHHHHHHHH-                     -IIIIII- -JJJJJJJ-  -KKKKKK-, -LLLLLL-  -MMMMMMM- -NNNNNN- O  -P- -QQ-  -RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR-   -SSSSSSSSSSSS-   -TTTTTT-
Part Explanation
AAAA Timestamp request was logged (not recieved)
BBBB Logger name (synapse.access.(http|https).<tag>, where 'tag' is defined in the listeners config section, normally the port)
CCCC Line number in code
DDDD Log Level
EEEE Request Identifier (This identifier is shared by related log lines)
FFFF Source IP (Or X-Forwarded-For if enabled)
GGGG Server Port
HHHH Federated Server or Local User making request (blank if unauthenticated or not supplied)
IIII Total Time to process the request
JJJJ Time to send response over network once generated (this may be negative if the socket is closed before the response is generated)
KKKK Userland CPU time
LLLL System CPU time
MMMM Total time waiting for a free DB connection from the pool across all parallel DB work from this request
NNNN Total time waiting for response to DB queries across all parallel DB work from this request
OOOO Count of DB transactions performed
PPPP Response body size
QQQQ Response status code
Suffixed with ! if the socket was closed before the response was generated.
A 499! status code indicates that Synapse also cancelled request processing after the socket was closed.
RRRR Request
SSSS User-agent
TTTT Events fetched from DB to service this request (note that this does not include events fetched from the cache)

MMMM / NNNN can be greater than IIII if there are multiple slow database queries running in parallel.

Some actions can result in multiple identical http requests, which will return the same data, but only the first request will report time/transactions in KKKK/LLLL/MMMM/NNNN/OOOO - the others will be awaiting the first query to return a response and will simultaneously return with the first request, but with very small processing times.