Fixed bug where the argument signature for the invalidate event handler incorrectly formed, preventing invalidation events from being intercepted correctly. Pull request courtesy Dmitry Kulagin.
Updated the SQLAlchemy plugin to accommodate for changes to the URL object in SQLAlchemy 1.4.
The "pid" value that is collected by the client plugin and passed to the aggregator in order to disambiguate separate processes is now augmented by a six character random hex string, so that a single host that may have the same pid repeated, such as when process namespaces or containers are used, sends correct statistics for the same program name configuration.
Made large improvements to the connmon display, including a help screen, switching between program / host stats, and new stats views. Overall, as connmon is attempting to collect from collectd servers which may also be in a network of servers, the "interval" by which messages are received may be long, ten seconds by default and much more. To allow a console view to be meaningful, new stats are added that illustrate how many connects / checkouts have occurred over the last "interval". That way, even though you might never see the current number of "checkouts" go above zero, you can at least see that the last ten second interval had 25 checkouts occur. The checkouts per second number can be derived from other values shown in the display.
Fixed bug where the command line options to connmon didn't work due to incorrect argument signature for the main() function.
The "connmon" tool can now display stats for SQLAlchemy stats that are sent to a collectd server via the "network" plugin or through any other means. Previously, the connmon tool could only display stats for messages that were sent to a the collectd server by the SQLAlchemy-collectd plugin itself.
The server side configuration for "connmon" is now separate from that of the SQLAlchemy-collectd plugin, and the two plugins can run independently of each other. This allows for a configuration where many hosts send SQLAlchemy-collectd messages to local collectd servers for aggregation, and those servers then pass their messages onto another collectd server, where the "connmon" tool can provide a view inside the current stats.
In order to achieve this, major refactoring such that the internals now deal with data in terms of a structure which mirrors the collectd-python "Values" object is in place, along with a rearchitecture of the connmon tool such that it now consumes collectd "Values" objects from a particular collectd server regardless of how those "Values" arrived in that server.
Reorganized the tox.ini script so that a plain run of tox will run against a single interpreter. The "python setup.py test" command is no longer supported by setuptools and now emits a message that tox should be used.
Added additional resiliency to the network protocol, such that if an entirely garbled message is sent to the server (such as making a test connection with nc and sending random characters), the protocol parser reports that the message is invalid rather than producing KeyError due to not being able to locate a message type.
Added error resiliency to the server and client threads, so that exceptions which occur are logged and the thread continues to run. Additionally, fixed the logging handler in the server plugin so that stack traces for errors are added to the output.
Fixed bug where the port number included in the SQLAlchemy URL with the collectd_port query string value would not be coerced into an integer, failing when it is passed to the socket send operation.
The connmon real-time console UX, first developed as its own client/server project, has now been migrated to SQLAlchemy-collectd, consuming collectd events over UDP from the collectd server itself which runs the SQLAlchemy-collectd plugin. This greatly reduces the footprint and complexity of the previous connmon implementation and allows applications to be monitored both by traditional collectd consumers as well as the connmon console for a quick "top" of connection activity. See the "helloworld" example for further details.
Included tests within the Pypi release, establihsed a package manifest as well as added this changelog.