v68.0.0

Full changelog

Note: No changes in this release are actually breaking. We're doing this to have a clear cut before we merge the new SQLite-powered storage backend.

• General
  • Disable the glean.error.event_timestamp_clamped metric (#3500).
• Rust
  • Make rate_limit configurable in the configuration builder (#3495)
  • Experimental: Enable glean-sym on iOS (#3471)