How to use the grafanalib.core.Template function in grafanalib

#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import re
import attr
from grafanalib import core as g

DECREASING_ORDER_TOOLTIP = g.Tooltip(sort=g.SORT_DESC)
PANEL_HEIGHT = g.Pixels(300)
QUANTILES = [0.99, 0.9, 0.5]

SOURCE_TEMPLATE = g.Template(name="source", type="datasource", query="prometheus")


@attr.s
class Dashboard(g.Dashboard):
    time = attr.ib(default=g.Time("now-30d", "now"))
    # Make it possible to use $source as a source.
    templating = attr.ib(default=g.Templating(list=[SOURCE_TEMPLATE]))


# Graph is a g.Graph with reasonable defaults applied.
@attr.s
class Graph(g.Graph):
    dataSource = attr.ib(default="$source")
    span = attr.ib(default=g.TOTAL_SPAN)
    tooltip = attr.ib(default=DECREASING_ORDER_TOOLTIP)
    nullPointMode = attr.ib(default=None)

title="kube-controller-manager",
            panels=[
                d.simple_graph(
                    "Workqueue depths",
                    'workqueue_depth{endpoint="kube-controller-manager"}',
                    legend="{{name}}",
                )
            ],
            collapse=True,
        ),
        d.Row(title="Master VM", panels=VM_PANELS, collapse=True),
    ],
    templating=g.Templating(
        list=[
            d.SOURCE_TEMPLATE,
            g.Template(
                name="etcd_type",
                type="query",
                dataSource="$source",
                regex=r"\*\[+\]+(.*)",
                query="label_values(etcd_request_duration_seconds_count, type)",
                multi=True,
                includeAll=True,
                refresh=g.REFRESH_ON_TIME_RANGE_CHANGE,
            ),
            g.Template(
                name="etcd_operation",
                type="query",
                dataSource="$source",
                query="label_values(etcd_request_duration_seconds_count, operation)",
                multi=True,
                includeAll=True,

dataSource="$source",
                query="label_values(etcd_request_duration_seconds_count, operation)",
                multi=True,
                includeAll=True,
                refresh=g.REFRESH_ON_TIME_RANGE_CHANGE,
            ),
            g.Template(
                name="verb",
                type="query",
                dataSource="$source",
                query="label_values(apiserver_request_duration_seconds_count, verb)",
                multi=True,
                includeAll=True,
                refresh=g.REFRESH_ON_TIME_RANGE_CHANGE,
            ),
            g.Template(
                name="resource",
                type="query",
                dataSource="$source",
                regex="(.*)s",
                query="label_values(apiserver_request_duration_seconds_count, resource)",
                multi=True,
                includeAll=True,
                refresh=g.REFRESH_ON_TIME_RANGE_CHANGE,
            ),

regex=r"\*\[+\]+(.*)",
                query="label_values(etcd_request_duration_seconds_count, type)",
                multi=True,
                includeAll=True,
                refresh=g.REFRESH_ON_TIME_RANGE_CHANGE,
            ),
            g.Template(
                name="etcd_operation",
                type="query",
                dataSource="$source",
                query="label_values(etcd_request_duration_seconds_count, operation)",
                multi=True,
                includeAll=True,
                refresh=g.REFRESH_ON_TIME_RANGE_CHANGE,
            ),
            g.Template(
                name="verb",
                type="query",
                dataSource="$source",
                query="label_values(apiserver_request_duration_seconds_count, verb)",
                multi=True,
                includeAll=True,
                refresh=g.REFRESH_ON_TIME_RANGE_CHANGE,
            ),
            g.Template(
                name="resource",
                type="query",
                dataSource="$source",
                regex="(.*)s",
                query="label_values(apiserver_request_duration_seconds_count, resource)",
                multi=True,
                includeAll=True,