Cleanup .zuul.yaml

If we agree, that we don't need to test anything older than
wallaby, then we can clean .zuul.yaml like this. After we drop
wallaby in the future, we can remove even more.

Change-Id: Ie437138a5befde3fe559fc9e75b7a5772f543f98

.zuul.yaml

@@ -1,64 +1,8 @@
-- job:
-    name: telemetry-tempest-base
-    description: |
-      This job is for stable branch prior to Ussuri for testing
-      on py2.
-    parent: devstack-tempest
-    irrelevant-files:
-      - ^(test-|)requirements.txt$
-      - ^setup.cfg$
-      - ^doc/.*$
-      - ^.*\.rst$
-      - ^releasenotes/.*$
-    timeout: 7800
-    required-projects:
-      - openstack/devstack-gate
-      - openstack/panko
-      - openstack/aodh
-      - openstack/ceilometer
-      - openstack/telemetry-tempest-plugin
-      - openstack/heat-tempest-plugin
-      - openstack/heat
-      - openstack/dib-utils
-      - openstack/diskimage-builder
-      - openstack/tempest
-      - gnocchixyz/gnocchi
-    vars:
-      configure_swap_size: 8192
-      devstack_plugins:
-        heat: https://opendev.org/openstack/heat
-        ceilometer: https://opendev.org/openstack/ceilometer
-        aodh: https://opendev.org/openstack/aodh
-        panko: https://opendev.org/openstack/panko
-      devstack_services:
-        tempest: true
-      devstack_localrc:
-        TEMPEST_PLUGINS: '"/opt/stack/telemetry-tempest-plugin /opt/stack/heat-tempest-plugin"'
-        GNOCCHI_ARCHIVE_POLICY_TEMPEST: "ceilometer-high-rate"
-        CEILOMETER_BACKEND: "gnocchi"
-        CEILOMETER_PIPELINE_INTERVAL: 15
-        USE_PYTHON3: False
-        CEILOMETER_ALARM_THRESHOLD: 6000000000
-      devstack_local_conf:
-        test-config:
-          $TEMPEST_CONFIG:
-            telemetry:
-              disable_ssl_certificate_validation: True
-      tempest_test_regex: telemetry_tempest_plugin
-      tox_envlist: all
-    branches:
-      - stable/ocata
-      - stable/pike
-      - stable/queens
-      - stable/rocky
-      - stable/stein
-      - stable/train
-
 - job:
     name: telemetry-tempest-base
     parent: devstack-tempest
     description: |
-      This job is for testing on py3 which is Ussuri onwards.
+      This job is for testing telemetry components. We test stable branches from wallaby onwards.
     irrelevant-files:
       - ^(test-|)requirements.txt$
       - ^setup.cfg$
@@ -113,7 +57,6 @@
               disable_ssl_certificate_validation: True
       tempest_test_regex: telemetry_tempest_plugin
       tox_envlist: all
-      branches: ^(?!stable/(ocata|pike|queens|rocky|stein)).*$
 
 - job:
     name: telemetry-dsvm-integration
@@ -123,27 +66,11 @@
     name: telemetry-dsvm-integration
     parent: telemetry-tempest-base
     branches:
-      - stable/train
       - stable/wallaby
     vars:
       devstack_localrc:
         USE_PYTHON3: False
 
-- job:
-    name: telemetry-dsvm-integration
-    parent: telemetry-tempest-base
-    branches:
-      - stable/pike
-      - stable/queens
-      - stable/rocky
-    vars:
-      devstack_localrc:
-        USE_PYTHON3: False
-        GNOCCHI_ARCHIVE_POLICY_TEMPEST: "ceilometer-high"
-        GNOCCHI_ARCHIVE_POLICY: "high"
-        CEILOMETER_ALARM_AGGREGATION_METHOD: "mean"
-        CEILOMETER_ALARM_METRIC_NAME: "cpu_util"
-
 - job:
     name: telemetry-dsvm-integration-ipv6-only
     parent: devstack-tempest-ipv6
@@ -159,16 +86,6 @@
     override-checkout: stable/wallaby
     voting: false
 
-- job:
-    name: telemetry-dsvm-integration-train
-    parent: telemetry-dsvm-integration
-    nodeset: openstack-single-node-bionic
-    override-checkout: stable/train
-    voting: false
-    vars:
-      devstack_localrc:
-        USE_PYTHON3: True
-
 - job:
     name: telemetry-dsvm-integration-centos-8s
     nodeset: devstack-single-node-centos-8-stream
@@ -222,7 +139,6 @@
       jobs:
         - telemetry-dsvm-integration
         - telemetry-dsvm-integration-wallaby
-        - telemetry-dsvm-integration-train
         - telemetry-dsvm-integration-ipv6-only
         - telemetry-dsvm-integration-centos-9s
         - telemetry-dsvm-integration-centos-9s-fips