Indeed, there's not much in the docs.
Here's the initial decription:
https://github.com/tony2001/pinba_engine/wiki/Reports#Request_tags
You can also see request tags in `request` table, make sure it's been created with this DDL:
CREATE TABLE `request` (
`id` int(11) NOT NULL DEFAULT '0',
`hostname` varchar(32) DEFAULT NULL,
`req_count` int(11) DEFAULT NULL,
`server_name` varchar(64) DEFAULT NULL,
`script_name` varchar(128) DEFAULT NULL,
`doc_size` float DEFAULT NULL,
`mem_peak_usage` float DEFAULT NULL,
`req_time` float DEFAULT NULL,
`ru_utime` float DEFAULT NULL,
`ru_stime` float DEFAULT NULL,
`timers_cnt` int(11) DEFAULT NULL,
`status` int(11) DEFAULT NULL,
`memory_footprint` float DEFAULT NULL,
`schema` varchar(16) DEFAULT NULL,
`tags_cnt` int(11) DEFAULT NULL,
`tags` varchar(1024) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=PINBA DEFAULT CHARSET=latin1 COMMENT='request';
You also need make sure you're using an up-to-date version of Pinba, request tags are available since 1.1.0.
--
Wbr,
Antony Dovgal
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http://pinba.org - realtime profiling for PHP