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Editing: Statistics.txt
Statistics ========== This page is about the statistics support for Dovecot v2.3. For v2.1 and v2.2 see <Statistics.Old.txt>. See <Events.txt> for list of all events that can be used in statistics. Dovecot v2.3 supports gathering statistics from "events". Eventually all of the log messages should be events, so it will be possible to configure Dovecot to get statistics for anything that is logged. For debug messages it's possible to get statistics even if the message itself isn't logged. Currently there are no statistics logged by default (but this might change). You'll need to add some metrics: ---%<------------------------------------------------------------------------- metric name { # Individual events can be identified either by their name or source file:line location. # The source location of course can change between Dovecot versions, so it should be # avoided. event_name = example_event_name #source_location = example.c:123 # Space-separated list of categories that must match the event (e.g. "mail" or "storage") #categories = # List of fields in event parameters that are included in the metrics. # All events have a default "duration" field that doesn't need to be listed here. #fields = # List of key=value pairs that must match the event. The value can contain '?' and '*' wildcards. #filter { # field_key = wildcard #} } ---%<------------------------------------------------------------------------- Listing Statistics ------------------ The gathered statistics are available by running: ---%<------------------------------------------------------------------------- doveadm stats dump ---%<------------------------------------------------------------------------- Each event has a "duration" field, which tracks in microseconds how long the event existed. For example with imap_command_finished field it could be: ---%<------------------------------------------------------------------------- metric_name field count sum min max avg median %95 imap_commands duration 35 1190122 162 340477 34003 244 188637 ---%<------------------------------------------------------------------------- The above means: * count: There have been 35 IMAP commands * sum: The IMAP commands were running in total for 1190122 microseconds (= 1.1 seconds) * min: The fastest IMAP command took 162 microseconds * max: The slowest IMAP command took 340477 microseconds * avg: The average time spent on an IMAP commands was 34003 microseconds * median: The median time spent on an IMAP command was 244 microseconds * %95: 95% of the IMAP commands took 188637 microseconds or less The other fields (than duration) track whatever that field represents. For example with imap_command_finished's bytes_in field could be tracking how many bytes were being used by the IMAP commands. Non-numeric fields can also be tracked, although only the "count" is relevant to those. The stats counters are reset whenever the stats process is started, which also means a dovecot reload will reset statistics. Using 'doveadm stats -r' parameter will also reset the statistics atomically after they're dumped. Examples -------- ---%<------------------------------------------------------------------------- metric imap_select_no { event_name = imap_command_finished filter { name = SELECT tagged_reply_state = NO } } metric imap_select_no_notfound { event_name = imap_command_finished filter { name = SELECT tagged_reply = NO*Mailbox doesn't exist:* } } metric storage_http_gets { event_name = http_request_finished categories = storage filter { method = get } } ---%<------------------------------------------------------------------------- (This file was created from the wiki on 2019-06-19 12:42)
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