changelog

List of changes for each version

Version 0.4.2

• Reworked mod_qos reader to use httpcomponents httpclient instead of the HTTPURLConnection. It should now also work with HTTP digest authentication. HTTP Requests now send "metrics-sampler mod_qos" as User-Agent so that such requests can be filtered in the access logs. The input can now also specify any HTTP headers to be overwritten using:

  <mod_qos ...> </mod_qos>

Version 0.4.1

• Enable/disable sampler through the TCP control interface without restarting the application using e.g. echo "sampler stop" |nc localhost 28111
• Added service status command
• Added support for variable definition in inputs
• Added some common Weblogic and Tomcat JMX expressions in config/selectors/*.xml.example
• Renamed attribute abstract to template and template to parent

Version 0.4.0

• Renamed most of the XML configuration elements
• Added support for input templates
• Added support for sampler templates
• Fixed problems with multiple JDBC drivers
• Renamed to metrics-sampler (from jmx-sampler) as it better reflects the purpose of the application
• Improved debug logging
• Performance logging using "timings" logger in debug level
• Import local.sh settings from the starter script so that local settings do not get overwritten after an upgrade
• Added support for low level socket options for the JMX input
• Added support for placeholders in the name patterns
• Added some more default placeholders for the JMX input
• Added graceful shutdown command over a configured TCP/IP port
• Changed log format to contain the sampler name
• Changed logger most important logger names to reader.name, writer.name, sampler.name so that they can be separately be configured

Version 0.3.2

• Use -f option for readlink for better compatibility
• Added support for ignoring JMX object names (see config.xml.example)
• Added support for placeholders definitions - global (directly under configuration) and in the default sampler (see config.xml.example)
• Added support for mapping of placeholder values using ${fn:map(dictionary_key,placeholder_for_entry_key)} (see config.xml.example)

Version 0.3.1

• Switched to three number versioning
• Readers wrap the metric values in a MetricValue object containing a timestamp. This way metrics for older time intervals (than the current time) can be returned.
• Readers may not know the metadata before actually quering the metrics. In such cases the transformers fetch all metrics through a different method (readAllMetrics()).
• Added JDBC reader support
• The console output uses the metric's timestamp not the current timestamp
• The console output has correct time now (hh:mm not mm:hh)
• Graphite writer replaces spaces with underscores in metric names
• The check command outputs the number of matched metrics for each transformer
• Improved example configuration with hotspot and jrockit metrics
• Support for composite JMX metrics
• Switched to canonical jmx object names for better compatibility
• Do not check disabled samplers

Version 0.3

• Switched from ant to maven and modularized the readers/writers/etc
• Implemented a mod_qos reader
• Added check() method to samplers so that they can check their configurations

Version 0.2

• Added extension support using java SPI

Version 0.1

• Initial implementation of a simple jmx reader, graphite writer and regular expression transformations