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	diff --git a/swh/counters/cli.py b/swh/counters/cli.py
	--- a/swh/counters/cli.py
	+++ b/swh/counters/cli.py
	@@ -45,14 +45,26 @@
	@click.option(
	"--prefix", "-p", help="Topic prefix to use (e.g swh.journal.objects)",
	)
	+@click.argument(
	+ "journal_type", type=click.Choice(["keys", "messages"],),
	+)
	@click.pass_context
	-def journal_client(ctx, stop_after_objects, object_type, prefix):
	+def journal_client(ctx, stop_after_objects, object_type, prefix, journal_type):
	"""Listens for new messages from the SWH Journal, and count them
	+ if the 'journal_type' argument is 'keys', it will only count the distinct
	+ keys for each listened topic, if it's 'messages', the messages
	+ are deserialized to be able to count the distinct values
	+ of internal properties of the objects.
	`"""
	import functools

	+ from swh.journal.client import get_journal_client
	+
	from . import get_counters
	- from .journal_client import process_journal_messages
	+ from .journal_client import (
	+ process_journal_messages,
	+ process_journal_messages_by_keys,
	+ )

	config = ctx.obj["config"]
	journal_cfg = config["journal"]
	@@ -69,11 +81,20 @@
	if journal_cfg["prefix"] is None:
	raise ValueError("'prefix' must be specified by cli or configuration")

	- client = KeyOrientedJournalClient(**journal_cfg,)
	-
	counters = get_counters(**config["counters"])

	- worker_fn = functools.partial(process_journal_messages, counters=counters,)
	+ if journal_type == "keys":
	+ client = KeyOrientedJournalClient(**journal_cfg,)
	+ worker_fn = functools.partial(
	+ process_journal_messages_by_keys, counters=counters,
	+ )
	+ elif journal_type == "messages":
	+ client = get_journal_client(cls="kafka", **journal_cfg,)
	+ worker_fn = functools.partial(process_journal_messages, counters=counters,)
	+
	+ assert client is not None
	+ assert worker_fn is not None
	+
	nb_messages = 0
	try:
	nb_messages = client.process(worker_fn)
	diff --git a/swh/counters/journal_client.py b/swh/counters/journal_client.py
	--- a/swh/counters/journal_client.py
	+++ b/swh/counters/journal_client.py
	@@ -8,10 +8,48 @@
	from swh.counters.redis import Redis


	-def process_journal_messages(
	+def process_journal_messages_by_keys(
	messages: Dict[str, Iterable[Any]], *, counters: Redis
	) -> None:
	- """Worker function for `JournalClient.process(worker_fn)`"""
	+ """Count the number of different keys for a given message type"""

	for key in messages.keys():
	counters.add(key, messages[key])
	+
	+
	+def process_journal_messages(
	+ messages: Dict[str, Iterable[Any]], *, counters: Redis
	+) -> None:
	+ """Count the number of different values of an object's property.
	+ It allow for example to count the persons inside the
	+ Release (authors) and Revision (authors and committers) classes
	+ """
	+
	+ if "revision" in messages:
	+ process_revisions(messages["revision"], counters)
	+
	+ if "release" in messages:
	+ process_releases(messages["release"], counters)
	+
	+
	+def process_revisions(revisions: Iterable[Dict], counters: Redis):
	+ """Count the number of different authors and committers on the
	+ revisions (in the person collection)"""
	+ persons = set()
	+ for revision in revisions:
	+ persons.add(revision["author"]["fullname"])
	+ persons.add(revision["committer"]["fullname"])
	+
	+ counters.add("person", list(persons))
	+
	+
	+def process_releases(releases: Iterable[Dict], counters: Redis):
	+ """Count the number of different authors on the
	+ releases (in the person collection)"""
	+ persons = set()
	+ for release in releases:
	+ author = release.get("author")
	+ if author and "fullname" in author:
	+ persons.add(author["fullname"])
	+
	+ counters.add("person", list(persons))
	diff --git a/swh/counters/tests/conftest.py b/swh/counters/tests/conftest.py
	--- a/swh/counters/tests/conftest.py
	+++ b/swh/counters/tests/conftest.py
	@@ -33,3 +33,8 @@
	# Cleanup redis between 2 tests
	rc = RedisClient(host=redis_proc.host, port=redis_proc.port)
	rc.flushall()
	+
	+
	+@pytest.fixture
	+def local_redis_host(local_redis):
	+ return f"{local_redis.host}:{local_redis.port}"
	diff --git a/swh/counters/tests/test_cli.py b/swh/counters/tests/test_cli.py
	--- a/swh/counters/tests/test_cli.py
	+++ b/swh/counters/tests/test_cli.py
	@@ -42,10 +42,9 @@


	def test__journal_client__worker_function_invoked(
	- mocker, kafka_server, kafka_prefix, journal_config
	+ mocker, kafka_server, kafka_prefix, journal_config, local_redis_host
	):
	- mock = mocker.patch("swh.counters.journal_client.process_journal_messages")
	- mock.return_value = 1
	+ mock = mocker.patch("swh.counters.journal_client.process_journal_messages_by_keys")

	producer = Producer(
	{
	@@ -61,26 +60,33 @@
	invoke(
	False,
	# Missing --object-types (and no config key) will make the cli raise
	- ["journal-client", "--stop-after-objects", "1", "--object-type", "content"],
	+ [
	+ "journal-client",
	+ "--stop-after-objects",
	+ "1",
	+ "--object-type",
	+ "content",
	+ "keys",
	+ ],
	journal_config,
	- redis_host="localhost",
	+ redis_host=local_redis_host,
	)

	assert mock.call_count == 1


	-def test__journal_client__missing_main_journal_config_key():
	+def test__journal_client__missing_main_journal_config_key(local_redis_host):
	"""Missing configuration on journal should raise"""
	with pytest.raises(KeyError, match="journal"):
	invoke(
	catch_exceptions=False,
	- args=["journal-client", "--stop-after-objects", "1",],
	+ args=["journal-client", "--stop-after-objects", "1", "messages"],
	config="", # missing config will make it raise
	- redis_host=None,
	+ redis_host=local_redis_host,
	)


	-def test__journal_client__missing_journal_config_keys():
	+def test__journal_client__missing_journal_config_keys(local_redis_host):
	"""Missing configuration on mandatory journal keys should raise"""
	kafka_prefix = "swh.journal.objects"
	journal_objects_config = JOURNAL_OBJECTS_CONFIG_TEMPLATE.format(
	@@ -106,13 +112,14 @@
	kafka_prefix,
	"--object-type",
	"content",
	+ "keys",
	],
	config=yaml_cfg, # incomplete config will make the cli raise
	- redis_host=None,
	+ redis_host=local_redis_host,
	)


	-def test__journal_client__missing_prefix_config_key(kafka_server):
	+def test__journal_client__missing_prefix_config_key(kafka_server, local_redis_host):
	"""Missing configuration on mandatory prefix key should raise"""

	journal_cfg_template = """
	@@ -136,13 +143,16 @@
	"1",
	"--object-type",
	"content",
	+ "messages",
	],
	journal_cfg,
	- redis_host=None,
	+ redis_host=local_redis_host,
	)


	-def test__journal_client__missing_object_types_config_key(kafka_server):
	+def test__journal_client__missing_object_types_config_key(
	+ kafka_server, local_redis_host
	+):
	"""Missing configuration on mandatory object-types key should raise"""

	journal_cfg = JOURNAL_OBJECTS_CONFIG_TEMPLATE.format(
	@@ -153,15 +163,23 @@
	invoke(
	False,
	# Missing --object-types (and no config key) will make the cli raise
	- ["journal-client", "--stop-after-objects", "1",],
	+ ["journal-client", "--stop-after-objects", "1", "keys"],
	journal_cfg,
	- redis_host=None,
	+ redis_host=local_redis_host,
	)


	-def test__journal_client__key_received(mocker, kafka_server):
	- mock = mocker.patch("swh.counters.journal_client.process_journal_messages")
	- mock.return_value = 1
	+@pytest.mark.parametrize(
	+ "message_handling, worker_fn",
	+ [
	+ ("keys", "swh.counters.journal_client.process_journal_messages_by_keys"),
	+ ("messages", "swh.counters.journal_client.process_journal_messages"),
	+ ],
	+)
	+def test__journal_client__key_received(
	+ mocker, kafka_server, local_redis_host, message_handling, worker_fn
	+):
	+ mock = mocker.patch(worker_fn)

	prefix = "swh.journal.objects"
	object_type = "content"
	@@ -193,16 +211,41 @@
	object_type,
	"--prefix",
	prefix,
	+ message_handling,
	],
	journal_cfg,
	- redis_host=None,
	+ redis_host=local_redis_host,
	)

	# Check the output
	expected_output = "Processed 1 messages.\nDone.\n"
	assert result.exit_code == 0, result.output
	assert result.output == expected_output
	+ assert mock.called
	assert mock.call_args[0][0]["content"]
	assert len(mock.call_args[0][0]) == 1
	assert object_type in mock.call_args[0][0].keys()
	- assert key == mock.call_args[0][0][object_type][0]
	+
	+
	+def test__journal_client__no_journal_type_argument_should_raise(
	+ kafka_server, local_redis_host
	+):
	+ journal_cfg = JOURNAL_OBJECTS_CONFIG_TEMPLATE.format(
	+ broker=kafka_server, prefix="prefix", group_id="test-consumer"
	+ )
	+
	+ with pytest.raises(SystemExit):
	+ invoke(
	+ False,
	+ [
	+ "journal-client",
	+ "--stop-after-objects",
	+ "1",
	+ "--object-type",
	+ "object_type",
	+ "--prefix",
	+ "prefix",
	+ ],
	+ journal_cfg,
	+ redis_host=local_redis_host,
	+ )
	diff --git a/swh/counters/tests/test_journal_client.py b/swh/counters/tests/test_journal_client.py
	--- a/swh/counters/tests/test_journal_client.py
	+++ b/swh/counters/tests/test_journal_client.py
	@@ -3,8 +3,107 @@
	# License: GNU General Public License version 3, or any later version
	# See top-level LICENSE file for more information

	-from swh.counters.journal_client import process_journal_messages
	+from typing import Dict, Optional
	+
	+import pytest
	+
	+from swh.counters.journal_client import (
	+ process_journal_messages,
	+ process_journal_messages_by_keys,
	+ process_releases,
	+ process_revisions,
	+)
	from swh.counters.redis import Redis
	+from swh.model.hashutil import hash_to_bytes
	+from swh.model.model import (
	+ ObjectType,
	+ Person,
	+ Release,
	+ Revision,
	+ RevisionType,
	+ Timestamp,
	+ TimestampWithTimezone,
	+)
	+
	+PROCESSING_METHODS = {
	+ "release": "swh.counters.journal_client.process_releases",
	+ "revision": "swh.counters.journal_client.process_revisions",
	+}
	+
	+DATE = TimestampWithTimezone(
	+ timestamp=Timestamp(seconds=0, microseconds=0), offset=0, negative_utc=False
	+)
	+
	+
	+def _get_processing_method_mocks(mocker):
	+ return {
	+ message_type: mocker.patch(PROCESSING_METHODS[message_type])
	+ for message_type in PROCESSING_METHODS.keys()
	+ }
	+
	+
	+def _create_release(author_fullname: Optional[str]) -> Dict:
	+ """Use Release.to_dict to be sure the field's name used to retrieve
	+ the author is correct"""
	+
	+ author = None
	+ if author_fullname:
	+ author = Person(fullname=bytes(author_fullname, "utf-8"), name=None, email=None)
	+
	+ release = Release(
	+ id=hash_to_bytes("34973274ccef6ab4dfaaf86599792fa9c3fe4689"),
	+ name=b"Release",
	+ message=b"Message",
	+ target=hash_to_bytes("34973274ccef6ab4dfaaf86599792fa9c3fe4689"),
	+ target_type=ObjectType.CONTENT,
	+ synthetic=True,
	+ author=author,
	+ )
	+
	+ return release.to_dict()
	+
	+
	+def _create_revision(author_fullname: str, committer_fullname: str) -> Revision:
	+ """Use Revision.to_dict to be sure the names of the fields used to retrieve
	+ the author and the committer are correct"""
	+ revision = Revision(
	+ committer_date=DATE,
	+ date=None,
	+ type=RevisionType.GIT,
	+ parents=(),
	+ directory=hash_to_bytes("34973274ccef6ab4dfaaf86599792fa9c3fe4689"),
	+ synthetic=True,
	+ message=None,
	+ author=Person(fullname=bytes(author_fullname, "utf-8"), name=None, email=None),
	+ committer=Person(
	+ fullname=bytes(committer_fullname, "utf-8"), name=None, email=None
	+ ),
	+ )
	+
	+ return revision.to_dict()
	+
	+
	+RELEASES = [
	+ _create_release(author_fullname="author 1"),
	+ _create_release(author_fullname="author 2"),
	+ _create_release(author_fullname=None),
	+]
	+
	+
	+RELEASES_AUTHOR_FULLNAMES = {b"author 1", b"author 2"}
	+
	+
	+REVISIONS = [
	+ _create_revision(author_fullname="author 1", committer_fullname="committer 1"),
	+ _create_revision(author_fullname="author 2", committer_fullname="committer 2"),
	+ _create_revision(author_fullname="author 2", committer_fullname="committer 1"),
	+ _create_revision(author_fullname="author 1", committer_fullname="committer 2"),
	+]
	+
	+
	+REVISIONS_AUTHOR_FULLNAMES = {b"author 1", b"author 2"}
	+REVISIONS_COMMITTER_FULLNAMES = {b"committer 1", b"committer 2"}
	+REVISIONS_PERSON_FULLNAMES = REVISIONS_AUTHOR_FULLNAMES \| REVISIONS_COMMITTER_FULLNAMES


	def test__journal_client__all_keys(mocker):
	@@ -15,7 +114,7 @@

	keys = {"coll1": [b"key1", b"key2"], "coll2": [b"key3", b"key4", b"key5"]}

	- process_journal_messages(messages=keys, counters=redis)
	+ process_journal_messages_by_keys(messages=keys, counters=redis)

	assert mock.call_count == 2

	@@ -26,3 +125,73 @@
	second_call_args = mock.call_args_list[1]
	assert second_call_args[0][0] == "coll2"
	assert second_call_args[0][1] == keys["coll2"]
	+
	+
	+def test__journal_client__unsupported_messages_do_nothin(mocker):
	+ mocks = _get_processing_method_mocks(mocker)
	+
	+ messages = {"fake_type": [{"keys": "value"}]}
	+
	+ process_journal_messages(messages=messages, counters=None)
	+
	+ for mocked_method in mocks.keys():
	+ assert not mocks[mocked_method].called
	+
	+
	+@pytest.mark.parametrize("message_type", ["release", "revision"])
	+def test__journal_client__right_method_per_message_type_is_called(mocker, message_type):
	+ mocks = _get_processing_method_mocks(mocker)
	+
	+ messages = {message_type: [{"k1": "v1"}, {"k2": "v2"}]}
	+
	+ process_journal_messages(messages=messages, counters=None)
	+
	+ for mocked_method in mocks.keys():
	+ if mocked_method == message_type:
	+ assert mocks[mocked_method].call_count == 1
	+ else:
	+ assert not mocks[mocked_method].called
	+
	+
	+def test__journal_client_process_revisions(mocker):
	+ mock = mocker.patch("swh.counters.redis.Redis.add")
	+
	+ redis = Redis(host="localhost")
	+
	+ process_revisions(REVISIONS, redis)
	+
	+ assert mock.call_count == 1
	+ first_call_args = mock.call_args_list[0]
	+ assert first_call_args[0][0] == "person"
	+ assert first_call_args[0][1] == list(REVISIONS_PERSON_FULLNAMES)
	+
	+
	+def test__journal_client_process_releases(mocker):
	+ mock = mocker.patch("swh.counters.redis.Redis.add")
	+
	+ redis = Redis(host="localhost")
	+
	+ process_releases(RELEASES, redis)
	+
	+ assert mock.call_count == 1
	+ first_call_args = mock.call_args_list[0]
	+ assert first_call_args[0][0] == "person"
	+ assert first_call_args[0][1] == list(RELEASES_AUTHOR_FULLNAMES)
	+
	+
	+def test__journal_client_process_releases_without_authors(mocker):
	+ mock = mocker.patch("swh.counters.redis.Redis.add")
	+
	+ releases = [
	+ _create_release(author_fullname=None),
	+ _create_release(author_fullname=None),
	+ ]
	+
	+ redis = Redis(host="localhost")
	+
	+ process_releases(releases, redis)
	+
	+ assert mock.called == 1
	+ first_call_args = mock.call_args_list[0]
	+ assert first_call_args[0][0] == "person"
	+ assert first_call_args[0][1] == []

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