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- If no analyzerPlugins block is present in global.conf, initialization
of the data analytics framework will be skipped without terminating the
pusher

- Analyzers in on-demand mode now cache units that have been queried
and resolved recently, to speed up response times and reduce overhead
- Once the cache reaches its maximum size, the oldest entry is removed
upon every insertion

- When the analyzer is created, we check whether it only has the root
unit; if so, the unit is immediately resolved and instantiated even if
the analyzer is on-demand

- Auto-publish has been split in two parts: construction of the
sensor names is performed within the Configurators, whereas the MQTT
messages are sent from the MQTTPusher
- This way, sensors always have the correct names upon plugin reloads
- Will make switching to textual MQTT topics easier

- By setting the "streaming" attribute to false, users
can instantiate analyzers that are available only on-demand for requests
on the REST API
- The input/output config will be used to instantiate an unit on the fly
starting from the node queried by the user
- Computation is performed and the result is returned, no data is pushed
on MQTT or to the database

- Added basic obsolescence checks in QueryEngine
- REST API GET requests now output actual JSON when requested
- Other minor changes

- Mostly working, still under testing
- Users can define custom analyzer-specific REST PUT actions
- Support for on-demand data analytics computation via REST coming up

- Fixed a minor bug in QueryEngine that broke thread safety
- The all and all-recursive clauses for unit input sensors do not
replace all existing sensors anymore, but only add the remaining ones

- Fixed a bug in the QueryEngine that caused wrong cache
sections to be selected for sensor data
- Now AverageAnalyzer actually computes sensor averages

- Unit instantiation logic moved to UnitGenerator
- Regex-based filtering system to configure units was added
- Thread safety in QueryEngine access addressed
- Tons of bugfixes

- First working version of Data Analytics Framework
- A test plugin that performs the sum and max of its input sensors was
implemented

- Subsampling behavior with delta fixed: the deltas that
are sent over MQTT are coherent with the subsampling frequency, and are
computed separately from the local high-frequency deltas
- Added exception handling when writing to sensor file sinks
- Fixed odd ProcFS behavior that led to reading constant values from
certain files by closing and re-opening every time. Overhead seems to
be negligible

- Basic framework structure to perform streaming data analytics
on dcdbpusher
- Code currently compiles, but is not tested and integration with
dcdbpusher is still in progress
- Do not attempt to use this code yet :)

Fixing opening of MQTT connections again after the fix has been reverted during the latest merge. See 8b9bbaf7

- Now sensors can be configured to be automatically written to files
(sink param)
- A per-sensor subsampling feature has also been added, allowing to
decimate the frequency of readings sent to MQTT compared to those that
have been sampled
- Also fixed a bug in MQTTpusher that caused reduced message rates

Deleted plugins which were meant to be deleted. msr plugin may be needed later on, but in previous commit it is anyway not usable

- This allows for the correct operation of templated instantiation,
and all derived attributes on top of those from SensorBase are copied
- Added some minor visual feedback for qosLevel and maxMsgNum