plans for 2.0

[brharrington]

While it is probably a ways off, this is an issue to track possible breaking changes for a 2.0 version.

Java

• Change baseline to jdk 11 or 17. Ideally move to 17 if possible, that seems to be the approach for other projects like Spring.
• Switch from jakarta packages for servlet support and inject annotations.
• Should we switch from slf4j to System.getLogger?

Remove Legacy Sub-projects

• spectator-ext-aws? probably not as the v1 SDK will be in use for a long time
• spectator-ext-log4j1, log4j1 has been EOL for many years
• spectator-ext-placeholders? doesn't have much use
• spectator-ext-sandbox?
• spectator-ext-spark?
• spectator-nflx-plugin
• spectator-nflx
• spectator-reg-metrics3?
• spectator-reg-servo
• spectator-web-spring? probably better to use micrometer integration with spectator