Meta tag and http api improvements, lineage metadata, per partition metrics and more

meta tags

• correctly clear enrichment cache on upsert #1472
• meta tag records must be optional in meta tag upsert requests #1473
• Persist meta records to Cassandra index #1471
• Remove hashing in enricher #1512
• skip meta tag enrichment when we can #1515
• Optimize autocomplete queries #1514
• Performance optimizations for meta tag queries #1517
• Rewrite enricher to use map lookup #1523

reorder buffer

• version v0.13.0-188-g6cd12d6 introduces storage-schemas.conf option 'reorderBufferAllowUpdate' to allow for some data to arrive out of order. #1531

http api

• Added "ArgQuotelessString" argument for interpreting strings in the request that don't have quotes around tem (e.g. keepLastValue INF)
• Fix /find empty response resulting in "null" #1464
• patch and update macaron/binding middleware to support content-length header for GET requests #1466
• Fix removeAboveBelowPercentile panic #1518
• rollup indicator (lineage information in response metadata) #1481, #1508
• return proper errors upon bad request from user #1520
• correct for delayed lastUpdate updates #1532

monitoring

• report the priority and readiness per partition as a metric #1504, #1507
• dashboard fix: maxSeries not a valid groupByNodes callback. #1491
• MemoryReporter: make call to runtime.ReadMemStats time bound to avoid lost metrics #1494

tools

• remove deprecated cli argument ttls from mt-whisper-importer-writer
• add tool to calculate the id of metrics: mt-keygen #1526

misc

• Don't validate MaxChunkSpan if BigTable store is disabled #1470
• lower default max chunk cache size to 512MB #1476
• add initial hosted metrics graphite documentation #1501, #1502
• Add 'benchmark' target to Makefile that runs all benchmarks #1498
• in cluster calls, set user agent #1469

docker stack

• cleanup docker img versions #1479
• remove metrictank bits from graphite-storage-schemas.conf files #1553