...
runtimeOptions.debug.plugin = 1
or even on the whole system:
runtimeOptions.debug = 1
What for debug output is produced, depends on the plugin or section you have enabled. Normally the debug output is written directly to PHP error log.
...
runtimeOptions.debug.plugin.transit = 1 ; for extended mismatch output and extended output on import errors
runtimeOptions.debug.plugin.transit = 3 ;&2 for TransitInfoFields
runtimeOptions.debug.plugin.transit = 7 ;&4 for strict mode in mismatch output
runtimeOptions.debug.plugin.TermTagger = 1
runtimeOptions.debug.plugin.SegmentStatistics = 1
runtimeOptions.debug.plugin.ArchiveTaskBeforeDelete = 1
HTTP Request debugging
All HTTP Request implementations using the Zend_Http_Client instanced via ZfExtended_Factory::get can be easily debugged:
just set in the installation.ini
debug.httpclient = 1
or to a string to filter the logged URLs. This example would log only requests to OpenTM2.
debug.httpclient = otmmemory
If enabled the content transfered to and from an external HTTP Service is then logged to the PHP error log