Werk #4289: mysql.innodb_io: fixed incomplete data handling

Component	Checks & agents
Title	mysql.innodb_io: fixed incomplete data handling
Date	Jan 11, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8p16 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

If the values 'Innodb_data_read' and 'Innodb_data_written' are missing the check no longer crashes but reports 'Incomplete agent output'

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