Upstream has released mysqld_exporter 0.9.0 with bugfixes and improvements
## 0.9.0 / 2016-09-26 BREAKING CHANGES: * InnoDB buffer pool page stats have been renamed/fixed to better support aggregations (#130) * [FEATURE] scrape slave status for multisource replication #134 * [FEATURE] Add client statistics support (+ add tests on users & clients statistics) #138 * [IMPROVEMENT] Consistency of error logging. #144 * [IMPROVEMENT] Add label aggregation for innodb buffer metrics #130 * [IMPROVEMENT] Improved and fixed user/client statistics #149 * [FEATURE] Added the last binlog file number metric. #152 * [MISC] Add an example recording rules file #156 * [FEATURE] Added PXC/Galera info metrics. #155 * [FEATURE] Added metrics from SHOW ENGINE INNODB STATUS. #160 * [IMPROVEMENT] Fix wsrep_cluster_status #146