Release 0.9.0

• breaking change Update semantic-metrics and replace meters with counters
• Use protobuf for shell serialization
• Replace lombok JSONified data classes with autovalue
• [metadata] delete deprecated v1 backend
• Replace data classes with kotlin
• Delombokify constructor annotations
• Refactor documentation
• [heroic-dist] include http fields in shaded jar
• [elasticsearch-utils] enable dynamic lookup of nodes

0.8.7: Tracing to heroic with fixes

• Autovalue import was missing for EnvironmentMetadata
• Handle Text Format Getter null pointer exception

0.8.6: Add tracing to heroic

Add tracing to heroic

0.8.5: Merge pull request #406 from spotify/suggestfail

• [core] add protobuf schema
• [core] deprecate host field in spotify schema
• Upgrade jackson databind to version 2.8.11.3
• [core] modify proto schema to accept compressed batches
• [elasticsearch-utils] drop log level for cache miss to debug
• Don't mark all api nodes as unhealthy if only suggest is failing