Server Discovery and Monitoring (SDAM) Monitoring

An SDAM monitoring event related to topology updates.

A protocol for handlers of events relating to SDAM to implement.

Published when a server is initialized.

Published when a server is closed.

A struct representing a network address, consisting of a host and port.

A struct describing a mongod or mongos process.

Published when a server description changes. This does NOT include changes to the server’s roundTripTime property.

Published when the server monitor’s “hello” command is started - immediately before the “hello” command is serialized into raw BSON and written to the socket.

Published when the server monitor’s “hello” command fails, either with an “ok: 0” or a socket exception.

Published when the server monitor’s “hello” command succeeds.

Published when a topology is initialized.

Published when a topology is closed.

Published when a topology description changes.

A struct describing the state of a MongoDB deployment: its type (standalone, replica set, or sharded), which servers are up, what type of servers they are, which is primary, and so on.