1MongoDB::Monitoring(3)User Contributed Perl DocumentationMongoDB::Monitoring(3)
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NAME

6       MongoDB::Monitoring - Internal event monitoring API for instrumentation
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VERSION

9       version v2.2.2
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DESCRIPTION

12       The MongoDB::MongoClient takes an optional "monitoring_callback"
13       attribute, which can be used to monitor events that occur during the
14       operation of the driver.
15
16       The API is very simple: given a code reference, a hashref for each
17       event is passed to the code reference.  Here is a simple example that
18       just accumulates events in an array:
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20           our @events;
21           my $cb = sub { push @events, $_[0] };
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23           MongoDB->connect( $uri, { monitoring_callback => $cb } );
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EVENT TYPES

26       Every event is a hash reference, with a "type" field indicating the
27       type, e.g. "command_started".  Each type is described below.
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29   Command Monitoring
30       These events are fired for commands directly to the wire and the
31       response.
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33       command_started
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35       This event is sent just before a command is put one the wire.  It will
36       be followed by either a "command_succeeded" or "command_failed" event.
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38       Fields:
39
40       •   type: "command_started"
41
42       •   databaseName: the name of the database to which the command applies
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44       •   commandName: the name of the command being executed; for legacy
45           operations that don't use commands, the driver will convert them to
46           appear as if they are in command form.
47
48       •   command: a hash reference representing the full command to be sent
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50       •   requestId: the request identifier sent to the server
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52       •   connectionId: address and port of the destination server
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54       command_succeeded
55
56       This event is sent just after a command reply is received, but only if
57       the database reply document contains a non-false "ok" field.  NOTE:
58       write errors will have "ok:1" even though they have write errors; for
59       writes, success indicates that the write attempt was valid, not that
60       the write succeeded.
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62       Fields:
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64       •   type: "command_succeeded"
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66       •   commandName: the name of the command being executed
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68       •   durationSecs: the elapsed time in seconds since the
69           "command_started" event.
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71       •   reply: a hash reference representing the full database reply
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73       •   requestId: the request identifier sent to the server
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75       •   connectionId: address and port of the destination server
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77       command_failed
78
79       This event is sent just after a command reply is received, but only if
80       the database reply document contains a false "ok" field or if an
81       exception occurred during send or receive operations.
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83       Fields:
84
85       •   type: "command_failed"
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87       •   commandName: the name of the command being executed
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89       •   durationSecs: the elapsed time in seconds since the
90           "command_started" event.
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92       •   failure: a string with a error message about the failure
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94       •   eval_error: if an exception occurs, this contains the value of $@
95           when the exception was caught
96
97       •   reply: a hash reference representing the full database reply or an
98           empty hashref if the failure is due to an exception
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100       •   requestId: the request identifier sent to the server
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102       •   connectionId: address and port of the destination server
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104   Server Discovery and Monitoring
105       These events are fired when servers and topology are amended.
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107       server_opening_event
108
109       This event is sent when a new server is added to the topology.
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111       Fields:
112
113       •   type: "server_opening_event"
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115       •   topologyId: The topology refaddr
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117       •   address: address of the server
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119       server_closed_event
120
121       This event is sent when a server is removed from the topology.
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123       Fields:
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125       •   type: "server_closed_event"
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127       •   topologyId: The topology refaddr
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129       •   address: address of the server
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131       server_description_changed_event
132
133       This event is sent when the server description changes, but does not
134       include changes to the RTT.
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136       Fields:
137
138       •   type: "server_description_changed_event"
139
140       •   address: address of the server
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142       •   topologyId: The topology refaddr
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144       •   previousDescription: Server Description before the change
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146       •   newDescription: Server Description after the change
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148       topology_opening_event
149
150       This event is sent when the topology is created.
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152       Fields:
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154       •   type: "topology_opening_event"
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156       •   topologyId: The topology refaddr
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158       topology_closed_event
159
160       This event is sent when the topology is closed.
161
162       Fields:
163
164       •   type: "topology_closed_event"
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166       •   topologyId: The topology refaddr
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168       topology_description_changed_event
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170       This event is sent when the topology description changes.
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172       Fields:
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174       •   type: "topology_description_changed_event"
175
176       •   topologyId: The topology refaddr
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178       •   previousDescription: Topology Description before the change
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180       •   newDescription: Topology Description after the change
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182       server_heartbeat_started_event
183
184       This event is sent before the ismaster command is sent to the server.
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186       Fields:
187
188       •   type: "server_heartbeat_started_event"
189
190       •   connectionId: address of the link to connect to
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192       server_heartbeat_succeeded_event
193
194       This event is sent after the reply from the ismaster command arrives
195       from a successful reply.
196
197       Fields:
198
199       •   type: "server_heartbeat_succeeded_event"
200
201       •   duration: time it took to send and receive a reply
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203       •   reply: the ismaster command reply
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205       •   connectionId: address of the server
206
207       server_heartbeat_failed_event
208
209       This event is sent if there is a failure from the ismaster command,
210       which returns an error string of some sort.
211
212       Fields:
213
214       •   type: "server_heartbeat_failed_event"
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216       •   duration: time it took to send and receive a reply
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218       •   failure: Returns an error string of the failure
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220       •   connectionId: address of the server
221

REDACTION

223       Certain commands are considered sensitive.  When any of the following
224       commands are seen in monitoring, the command body and database reply
225       body are replaced with an empty document:
226
227       •   authenticate
228
229       •   saslStart
230
231       •   saslContinue
232
233       •   getnonce
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235       •   createUser
236
237       •   updateUser
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239       •   copydbgetnonce
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241       •   copydbsaslstart
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AUTHORS

244       •   David Golden <david@mongodb.com>
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246       •   Rassi <rassi@mongodb.com>
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248       •   Mike Friedman <friedo@friedo.com>
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250       •   Kristina Chodorow <k.chodorow@gmail.com>
251
252       •   Florian Ragwitz <rafl@debian.org>
253

255       This software is Copyright (c) 2020 by MongoDB, Inc.
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257       This is free software, licensed under:
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259         The Apache License, Version 2.0, January 2004
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263perl v5.32.1                      2021-01-27            MongoDB::Monitoring(3)
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