Changes and removals for Oban 3.0 [HOLD]

[sorentwo]

To be changed before Oban 3.0:

Defaults

• Use scheduled_at as unique timestamp by default

Normalization

• Normalize telemetry states from executor (success => completed, etc)
• Normalize database states from drain_queue/1 (discard => discarded, success => completed, etc.)
• Remove Oban.Migrations alias

Config

• Remove :discard and {:discard, reason} return values
• Remove top-level crontab option
• Remove support for Oban.Queue.BasicEngine name
• Remove support for Oban.Plugins.Stager config
• Remove Oban.PostgresNotifier name
• Remove Oban.Peers.Postgres name
• Remove top-level circuit_backoff option
• Remove use of DYNO for node name
• Rename log to ecto_log, repo_log, or query_log

Plugins

• Remove Repeater plugin
• Remove Gossip plugin

Schema / Database

• Collapse migrations

Queue

• Remove producer telemetry event

Telemetry

• Default to structured logs, not JSON in default logger

⚠️ This is for tracking purposes as we have no intention of releasing 3.0 soon. Please do not send PRs!

[yordis]

Adding some context,

The discarded state is for internal use and should strictly mean when a job exhausts all retries. Cancelled is the appropriate state instead.