Package collectd.org/config

• New package to represent collectd configurations.
• The Block type corresponds to oconfig_item_t, the Value type corresponds to oconfig_value_t.
• Block.Unmarshal maps a config.Block hierarchy to a Go type.
• Block.MarshalText produces a text output that could be parsed by collectd as a config file.
• The Port type represents a port number in the configuration. It demonstrates how to override the default unmarshaling rules to implement specialized behavior, such as range checking.

Package collectd.org/plugin

• Configuration callbacks, i.e. types implementing the Configurer interface, have been added. They are registered with RegisterConfig. Thanks to @alowde!
• The new LogWriter type implements an io.Writer on top of collectd's logging infrastructure. This allows, for example, to create a log.Logger backed by collectd.

Package collectd.org/api

• The new ValueList.Clone method returns a copy of the value list.
• The new Fanout type replaces the Dispatcher type.
• The WriterFunc type wraps a function to implement the Writer interface.
• Meta data has been added to the ValueList type.

Package collectd.org/cdtime

• New and Time.Time: ensure that "time".Time maps to Time(0) and vice versa.
• Test coverage has been improved.

Package collectd.org/exec

• Executor.Run: Support for context cancellation has been added.
• Test coverage has been significantly improved.

Package collectd.org/export

• Run: Support for context cancellation has been added.
• Run: No longer aborts if the Writer fails.

Package collectd.org/format

• Putval: Support for meta data has been added.
• Test coverage has been improved.

Package collectd.org/meta

• New package implementing a type meta data, Data.

Package collectd.org/network

• Support for passing an existing connection to the server has been added.
• Server.ListenAndWrite: Support for context cancellation has been added.
• Test coverage has been significantly improved.

Package collectd.org/plugin

• Support for log callbacks has been added.
• Support for shutdown callbacks has been added. Thanks to @alowde!
• An out-of-bounds write triggered by the Write function has been fixed. #26
• The NewWriter function has been removed in favor of api.WriterFunc.
• The Reader interface has been changed to expect a context.Context to be passed to read callbacks. The context is cancelled depending on collectd's Timeout setting (which defaults to 2× interval).
• RegisterRead: collection interval and group name can optionally be specified.
• The new Interval function returns the interval of read callbacks.
• The new Name function returns the name of the plugin.
• Strings passed to the Register… functions are now freed on shutdown.
• Test coverage has been significantly improved.

Package collectd.org/rpc

• Re-generated protobufs with interface version 4.