Mitogen: deprecate the use of mitogen and remove coverage from CI

.gitlab-ci/packet.yml

@@ -39,8 +39,6 @@ packet_centos7-flannel-containerd-addons-ha:
   extends: .packet_pr
   stage: deploy-part2
   when: on_success
-  variables:
-    MITOGEN_ENABLE: "true"
   allow_failure: true
 
 packet_centos8-crio:
@@ -52,8 +50,6 @@ packet_ubuntu18-crio:
   extends: .packet_pr
   stage: deploy-part2
   when: manual
-  variables:
-    MITOGEN_ENABLE: "true"
 
 packet_ubuntu16-canal-kubeadm-ha:
   stage: deploy-part2
@@ -89,8 +85,6 @@ packet_debian10-containerd:
   stage: deploy-part2
   extends: .packet_pr
   when: on_success
-  variables:
-    MITOGEN_ENABLE: "true"
 
 packet_debian11-calico:
   stage: deploy-part2
@@ -214,31 +208,26 @@ packet_centos7-weave-upgrade-ha:
   when: on_success
   variables:
     UPGRADE_TEST: basic
-    MITOGEN_ENABLE: "false"
 
 # Calico HA Wireguard
 packet_ubuntu20-calico-ha-wireguard:
   stage: deploy-part2
   extends: .packet_pr
   when: manual
-  variables:
-    MITOGEN_ENABLE: "true"
 
 packet_debian9-calico-upgrade:
   stage: deploy-part3
   extends: .packet_pr
   when: on_success
   variables:
     UPGRADE_TEST: graceful
-    MITOGEN_ENABLE: "false"
 
 packet_debian9-calico-upgrade-once:
   stage: deploy-part3
   extends: .packet_periodic
   when: on_success
   variables:
     UPGRADE_TEST: graceful
-    MITOGEN_ENABLE: "false"
 
 packet_ubuntu18-calico-ha-recover:
   stage: deploy-part3

.gitlab-ci/terraform.yml

@@ -146,10 +146,6 @@ tf-validate-upcloud:
   OS_INTERFACE: public
   OS_IDENTITY_API_VERSION: "3"
   TF_VAR_router_id: "ab95917c-41fb-4881-b507-3a6dfe9403df"
-  # Since ELASTX is in Stockholm, Mitogen helps with latency
-  MITOGEN_ENABLE: "false"
-  # Mitogen doesn't support interpreter discovery yet
-  ANSIBLE_PYTHON_INTERPRETER: "/usr/bin/python3"
 
 tf-elastx_cleanup:
   stage: unit-tests

Makefile

@@ -1,5 +1,7 @@
 mitogen:
-	ansible-playbook -c local mitogen.yml -vv
+	@echo Mitogen support is deprecated.
+	@echo Please run the following command manually:
+	@echo   ansible-playbook -c local mitogen.yml -vv
 clean:
 	rm -rf dist/
 	rm *.retry

ansible.cfg

@@ -3,7 +3,6 @@ pipelining=True
 ssh_args = -o ControlMaster=auto -o ControlPersist=30m -o ConnectionAttempts=100 -o UserKnownHostsFile=/dev/null
 #control_path = ~/.ssh/ansible-%%r@%%h:%%p
 [defaults]
-strategy_plugins = plugins/mitogen/ansible_mitogen/plugins/strategy
 # https://github.com/ansible/ansible/issues/56930 (to ignore group names with - and .)
 force_valid_group_names = ignore
 

docs/ansible.md

@@ -251,7 +251,7 @@ For more information about Ansible and bastion hosts, read
 
 ## Mitogen
 
-You can use [mitogen](/docs/mitogen.md) to speed up kubespray.
+Mitogen support is deprecated, please see [mitogen related docs](/docs/mitogen.md) for useage and reasons for deprecation.
 
 ## Beyond ansible 2.9
 

docs/mitogen.md

@@ -1,5 +1,7 @@
 # Mitogen
 
+*Warning:* Mitogen support is now deprecated in kubespray due to upstream not releasing an updated version to support ansible 4.x (ansible-base 2.11.x) and above. The CI support has been stripped for mitogen and we are no longer validating any support or regressions for it. The supporting mitogen install playbook and integration documentation will be removed in a later version.
+
 [Mitogen for Ansible](https://mitogen.networkgenomics.com/ansible_detailed.html) allow a 1.25x - 7x speedup and a CPU usage reduction of at least 2x, depending on network conditions, modules executed, and time already spent by targets on useful work. Mitogen cannot improve a module once it is executing, it can only ensure the module executes as quickly as possible.
 
 ## Install
@@ -8,6 +10,21 @@
 ansible-playbook mitogen.yml
 ```
 
+Ensure to enable mitogen use by environment varialbles:
+
+```ShellSession
+export ANSIBLE_STRATEGY=mitogen_linear
+export ANSIBLE_STRATEGY_PLUGINS=plugins/mitogen/ansible_mitogen/plugins/strategy
+```
+
+... or `ansible.cfg` setup:
+
+```ini
+[defaults]
+strategy_plugins = plugins/mitogen/ansible_mitogen/plugins/strategy
+strategy=mitogen_linear
+```
+
 ## Limitation
 
 If you are experiencing problems, please see the [documentation](https://mitogen.networkgenomics.com/ansible_detailed.html#noteworthy-differences).

tests/scripts/testcases_run.sh

@@ -50,13 +50,6 @@ test "${UPGRADE_TEST}" != "false" && git fetch --all && git checkout "$KUBESPRAY
 test "${UPGRADE_TEST}" != "false" && git checkout "${CI_BUILD_REF}" tests/files/${CI_JOB_NAME}.yml
 test "${UPGRADE_TEST}" != "false" && git checkout "${CI_BUILD_REF}" ${CI_TEST_REGISTRY_MIRROR}
 
-# Install mitogen ansible plugin
-if [ "${MITOGEN_ENABLE}" = "true" ]; then
-  ansible-playbook ${ANSIBLE_LOG_LEVEL} mitogen.yml
-  export ANSIBLE_STRATEGY=mitogen_linear
-  export ANSIBLE_STRATEGY_PLUGINS=plugins/mitogen/ansible_mitogen/plugins/strategy
-fi
-
 # Create cluster
 ansible-playbook ${ANSIBLE_LOG_LEVEL} -e @${CI_TEST_REGISTRY_MIRROR} -e @${CI_TEST_VARS} -e local_release_dir=${PWD}/downloads --limit "all:!fake_hosts" cluster.yml