CHANGES:

- Validate file extension for `$ dune ocaml top-module`. (ocaml/dune#8005, fixes ocaml/dune#8004, @3Rafal)

- Include the time it takes to read/write state files when `--trace-file` is
  enabled (ocaml/dune#7960, @rgrinberg)

- Add `dune show` command group which is an alias of `dune describe`. (ocaml/dune#7946,
  @Alizter)

- Include source tree scans in the traces produced by `--trace-file` (ocaml/dune#7937,
  @rgrinberg)

- Cinaps: The promotion rules for cinaps would only offer one file at a time no
  matter how many promotions were available. Now we offer all the promotions at
  once (ocaml/dune#7901, @rgrinberg)

- Do not re-run OCaml syntax files on every iteration of the watch mode. This
  is too memory consuming. (ocaml/dune#7894, fix ocaml/dune#6900, @rgrinberg)

- Remove some compatibility code for old version of dune that generated
  `.merlin` files. Now dune will never remove `.merlin` files automatically
  (ocaml/dune#7562)

- Add `dune show env` command and make `dune printenv` an alias of it. (ocaml/dune#7985,
  @Alizter)

- Add additional metadata to the traces provided by `--trace-file` whenever
  `--trace-extended` is passed (ocaml/dune#7778, @rleshchinskiy)

- Extensions used in `(dialect)` can contain periods (e.g., `cppo.ml`). (ocaml/dune#7782,
  fixes ocaml/dune#7777, @nojb)

- Allow `(include_subdirs qualified)` to be used when libraries define a
  `(modules ...)` field (ocaml/dune#7797, fixes ocaml/dune#7597, @anmonteiro)

- `$ dune describe` is now a command group, so arguments to subcommands must be
  passed after subcommand itself. (ocaml/dune#7919, @Alizter)

- The `interface` and `implementation` fields of a `(dialect)` are now optional
  (ocaml/dune#7757, @gpetiot)

- Add commands `dune show targets` and `dune show aliases` that display all the
  available targets and aliases in a given directory respectively. (ocaml/dune#7770,
  grants ocaml/dune#265, @Alizter)

- Allow multiple globs in library's `(stdlib (internal_modules ..))`
  (@anmonteiro, ocaml/dune#7878)

- Attach melange rules to the default alias (ocaml/dune#7926, @haochenx)

- In opam constraints, reject `(and)` and `(or)` with no arguments at parse
  time (ocaml/dune#7730, @emillon)

- Compute digests and manage sandboxes in background threads (ocaml/dune#7947,
  @rgrinberg)

- Add `(build_if)` to the `(test)` stanza. When it evaluates to false, the
  executable is not built. (ocaml/dune#7899, fixes ocaml/dune#6938, @emillon)

- Add necessary parentheses in generated opam constraints (ocaml/dune#7682, fixes ocaml/dune#3431,
  @Lucccyo)

CHANGES:

- Validate file extension for `$ dune ocaml top-module`. (ocaml/dune#8005, fixes ocaml/dune#8004, @3Rafal)

- Include the time it takes to read/write state files when `--trace-file` is
  enabled (ocaml/dune#7960, @rgrinberg)

- Add `dune show` command group which is an alias of `dune describe`. (ocaml/dune#7946,
  @Alizter)

- Include source tree scans in the traces produced by `--trace-file` (ocaml/dune#7937,
  @rgrinberg)

- Cinaps: The promotion rules for cinaps would only offer one file at a time no
  matter how many promotions were available. Now we offer all the promotions at
  once (ocaml/dune#7901, @rgrinberg)

- Do not re-run OCaml syntax files on every iteration of the watch mode. This
  is too memory consuming. (ocaml/dune#7894, fix ocaml/dune#6900, @rgrinberg)

- Add `--all` option to `dune rpc status` to show all Dune RPC servers running.
  (ocaml/dune#8011, fix ocaml/dune#7902, @Alizter)

- Remove some compatibility code for old version of dune that generated
  `.merlin` files. Now dune will never remove `.merlin` files automatically
  (ocaml/dune#7562)

- Add `dune show env` command and make `dune printenv` an alias of it. (ocaml/dune#7985,
  @Alizter)

- Add additional metadata to the traces provided by `--trace-file` whenever
  `--trace-extended` is passed (ocaml/dune#7778, @rleshchinskiy)

- Extensions used in `(dialect)` can contain periods (e.g., `cppo.ml`). (ocaml/dune#7782,
  fixes ocaml/dune#7777, @nojb)

- Allow `(include_subdirs qualified)` to be used when libraries define a
  `(modules ...)` field (ocaml/dune#7797, fixes ocaml/dune#7597, @anmonteiro)

- `$ dune describe` is now a command group, so arguments to subcommands must be
  passed after subcommand itself. (ocaml/dune#7919, @Alizter)

- The `interface` and `implementation` fields of a `(dialect)` are now optional
  (ocaml/dune#7757, @gpetiot)

- Add commands `dune show targets` and `dune show aliases` that display all the
  available targets and aliases in a given directory respectively. (ocaml/dune#7770,
  grants ocaml/dune#265, @Alizter)

- Allow multiple globs in library's `(stdlib (internal_modules ..))`
  (@anmonteiro, ocaml/dune#7878)

- Attach melange rules to the default alias (ocaml/dune#7926, @haochenx)

- In opam constraints, reject `(and)` and `(or)` with no arguments at parse
  time (ocaml/dune#7730, @emillon)

- Compute digests and manage sandboxes in background threads (ocaml/dune#7947,
  @rgrinberg)

- Add `(build_if)` to the `(test)` stanza. When it evaluates to false, the
  executable is not built. (ocaml/dune#7899, fixes ocaml/dune#6938, @emillon)

- Add necessary parentheses in generated opam constraints (ocaml/dune#7682, fixes ocaml/dune#3431,
  @Lucccyo)