Various fixes & improvements
- ref(uptime): Improve uptime-results schema w/ definitions (304) by evanpurkhiser
- feat(issue-search): Add first_release_id to the group_attributes kafka schema (286) by snigdhas
- add schema, examples and topic definition for ingest-occurrences (301) by lynnagara
- fix(uptime): Bad UUIDs in examples (302) by evanpurkhiser
- fix(uptime): Allow request_info and http_status_code to be null (303) by evanpurkhiser
- fix snuba-metrics-summaries (300) by lynnagara
- ref: remove redundant property from topic files (299) by lynnagara
- set 10mb max.message bytes for metrics topics (298) by lynnagara