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

d.Row(title="etcd", panels=ETCD_PANELS, collapse=True),
        d.Row(title="kube-apiserver", panels=APISERVER_PANELS, collapse=True),
        d.Row(
            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",

"expr": sum(service_metric(m, "rate", resolution)),
                        "legendFormat": m,
                    }
                    for m in task_metrics
                ],
                span=3,
                steppedLine=True,
            ),
        ],
    )


dashboard = G.Dashboard(
    title="Generated SDK dashboard",
    rows=[resource_row(), resource_row(POD_TYPE_VARIABLE), scheduler_row(), task_row()],
    templating=G.Templating(
        list=[
            {
                "datasource": PROMETHEUS_DATA_SOURCE,
                "hide": 0,
                "name": FRAMEWORK_VARIABLE.lstrip("$"),
                "options": [],
                "query": "label_values(offers_received, dcos_service_name)",
                "refresh": REFRESH_ON_TIMERANGE_CHANGE,
                "regex": "",
                "sort": 0,
                "tagValuesQuery": "",
                "tags": [],
                "tagsQuery": "",
                "type": "query",
            },
            {

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)


@attr.s
class Row(g.Row):
    height = attr.ib(default=PANEL_HEIGHT)

default=False,
        validator=instance_of(bool),
    )
    id = attr.ib(default=None)
    inputs = attr.ib(default=attr.Factory(list))
    links = attr.ib(default=attr.Factory(list))
    refresh = attr.ib(default=DEFAULT_REFRESH)
    schemaVersion = attr.ib(default=SCHEMA_VERSION)
    sharedCrosshair = attr.ib(
        default=False,
        validator=instance_of(bool),
    )
    style = attr.ib(default=DARK_STYLE)
    tags = attr.ib(default=attr.Factory(list))
    templating = attr.ib(
        default=attr.Factory(Templating),
        validator=instance_of(Templating),
    )
    time = attr.ib(
        default=attr.Factory(lambda: DEFAULT_TIME),
        validator=instance_of(Time),
    )
    timePicker = attr.ib(
        default=attr.Factory(lambda: DEFAULT_TIME_PICKER),
        validator=instance_of(TimePicker),
    )
    timezone = attr.ib(default=UTC)
    version = attr.ib(default=0)
    uid = attr.ib(default=None)

    def _iter_panels(self):
        for row in self.rows:

validator=instance_of(bool),
    )
    id = attr.ib(default=None)
    inputs = attr.ib(default=attr.Factory(list))
    links = attr.ib(default=attr.Factory(list))
    refresh = attr.ib(default=DEFAULT_REFRESH)
    schemaVersion = attr.ib(default=SCHEMA_VERSION)
    sharedCrosshair = attr.ib(
        default=False,
        validator=instance_of(bool),
    )
    style = attr.ib(default=DARK_STYLE)
    tags = attr.ib(default=attr.Factory(list))
    templating = attr.ib(
        default=attr.Factory(Templating),
        validator=instance_of(Templating),
    )
    time = attr.ib(
        default=attr.Factory(lambda: DEFAULT_TIME),
        validator=instance_of(Time),
    )
    timePicker = attr.ib(
        default=attr.Factory(lambda: DEFAULT_TIME_PICKER),
        validator=instance_of(TimePicker),
    )
    timezone = attr.ib(default=UTC)
    version = attr.ib(default=0)
    uid = attr.ib(default=None)

    def _iter_panels(self):
        for row in self.rows:
            for panel in row._iter_panels():