v1.3.12

Misc improvements

• Removed unused PeekTokens method from the quota.Manager interface.
• Ensure goroutines never block in the subtree cache (#2272).
• Breaking unnecessary dependencies for Trillian clients:
  • Moved verifiers from merkle into merkle/{log,map}verifiersub-pacakges,
    reducing the amount of extra baggage inadvertently pulled in by clients.
• Concrete hashers have been moved into subpackages, separating them from their
  registration code, allowing clients to directly pull just the hasher they're
  interested in and avoid the Trillian/hasher registry+protobuf deps.
• Moved some packages intended for internal-only use into internal packages:
  • InMemoryMerkleTree (indended to only be used by Trillian tests)
• Removed wrapper for etcd client (#2288).
• Moved --quota_system and --storage_system flags to main.go so that they
  are initialised properly. It might break depending builds relying on these
  flags. Suggested fix: add the flags to main.go.
• Made signer tolerate mastership election failures [#1150].
• testdb no longer accepts the --test_mysql_uri flag, and instead honours the
  TEST_MYSQL_URI ENV var. This makes it easier to blanket configure tests to use a
  specific test DB instance.
• Removed experimental Skylog folder (#2297).
• Fixed a race condition in the operation manager that should only affect tests
  (#2302).
• Run gofumpt formatter on the whole repository (#2315).
• Refactor signer operation loop (#2294).

Upgrades

• Dockerfiles are now based on Go 1.13 image.
• The etcd is now pinned to v3.4.12.
• The golangci-lint suite is now at v1.36.0.
• CI/CD has migrated from Travis to Google Cloud Build.
• prometheus from 1.7.1 to 1.9.0 (#2239, #2270).
• go-cmp from 0.5.2 to 0.5.4 (#2262).
• apache/beam from 2.26.0+incompatible to 2.27.0+incompatible (#2273).
• lib/pq from 1.8.0 to 1.9.0 (#2264).
• go-redis from 6.15.8+incompatible to 6.15.9+incompatible (#2215).

Process

• Recognise that we do not follow strict semantic versioning practices.