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
diff --git a/.zuul.yaml b/.zuul.yaml
index 9caf6d6..613717d 100644
--- a/.zuul.yaml
+++ b/.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
@@ -123,28 +66,12 @@
     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
     description: |
@@ -160,16 +87,6 @@
     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
     parent: telemetry-dsvm-integration
@@ -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