How to use the grafanalib.core function in grafanalib

],
        yAxes=g.single_y_axis(format=g.MILLISECONDS_FORMAT),
    ),
    d.simple_graph(
        "etcd objects",
        "sum(etcd_object_counts) by (resource, instance)",
        legend="{{instance}}: {{resource}}",
    ),
    d.simple_graph(
        "etcd db size",
        [
            "etcd_mvcc_db_total_size_in_bytes",
            "etcd_mvcc_db_total_size_in_use_in_bytes",
            "etcd_server_quota_backend_bytes",
        ],
        yAxes=g.single_y_axis(format=g.BYTES_FORMAT),
    ),
]

APISERVER_PANELS = [
    d.simple_graph(
        "goroutines",
        'go_goroutines{job="master", endpoint="apiserver"}',
        legend="{{instance}}",
    ),
    d.simple_graph(
        "gc rate",
        'rate(go_gc_duration_seconds_count{job="master", endpoint="apiserver"}[1m])',
        legend="{{instance}}",
    ),
    d.simple_graph(
        "alloc rate",

),
    d.simple_graph(
        "etcd wal fsync duration",
        "histogram_quantile(1.0, sum(rate(etcd_disk_wal_fsync_duration_seconds_bucket[1m])) by (le, endpoint))",
        yAxes=g.single_y_axis(format=g.SECONDS_FORMAT),
    ),
    d.Graph(
        title="etcd compaction max pause",
        points=True,
        lines=False,
        targets=[
            g.Target(
                expr="histogram_quantile(1.0, sum(rate(etcd_debugging_mvcc_db_compaction_pause_duration_milliseconds_bucket[1m])) by (le, instance))"
            )
        ],
        yAxes=g.single_y_axis(format=g.MILLISECONDS_FORMAT),
    ),
    d.simple_graph(
        "etcd objects",
        "sum(etcd_object_counts) by (resource, instance)",
        legend="{{instance}}: {{resource}}",
    ),
    d.simple_graph(
        "etcd db size",
        [
            "etcd_mvcc_db_total_size_in_bytes",
            "etcd_mvcc_db_total_size_in_use_in_bytes",
            "etcd_server_quota_backend_bytes",
        ],
        yAxes=g.single_y_axis(format=g.BYTES_FORMAT),
    ),
]

def stacked(graph):
    """Turn a graph into a stacked graph."""
    return attr.assoc(
        graph,
        lineWidth=0,
        nullPointMode=G.NULL_AS_ZERO,
        stack=True,
        fill=10,
        tooltip=G.Tooltip(
            sort=G.SORT_DESC,
            valueType=G.INDIVIDUAL,
        ),

expr='sum(wormhole_signup_failure{pod=~"s4-signup.*"})',
                            legendFormat="Wormhole Signups Failed",
                            refId="C",
                        ),
                    ],
                ),
                G.Graph(
                    title="Usage",
                    dataSource=PROMETHEUS,

                    # Stack the connection graphs on each other, revealing
                    # both a total and a distribution across different grid
                    # router instances.
                    stack=True,
                    tooltip=G.Tooltip(
                        valueType=G.INDIVIDUAL,
                    ),

                    xAxis=X_TIME,
                    yAxes=[
                        G.YAxis(
                            format="none",
                            label="Count",
                        ),
                        G.YAxis(
                            format="none",
                            label="Count",
                        ),
                    ],
                    targets=[
                        G.Target(
                            expr="grid_router_connections",

title="Memory Usage",
        dataSource=datasource,

        xAxis=X_TIME,
        yAxes=[
            G.YAxis(
                # 2 ^ 30 bytes
                format="gbytes",
                label="Memory",
            ),
            G.YAxis(
                show=False,
            ),
        ],
        targets=[
            G.Target(
                expr="""
                sum(machine_memory_bytes) / 2 ^ 30
                """,
                legendFormat="Total Physical Memory",
                refId="A",
            ),
            G.Target(
                expr="""
                rss:container_memory:total / 2 ^ 30
                """,
                legendFormat="Total Container RSS",
                refId="B",
            ),