0.9.0

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