## Bug description

When going to instance status > internal metrics and refreshing the dashboard, the loading fails

https://user-images.githubusercontent.com/148820/120655500-693c7480-c48b-11eb-8c75-6afd4c967506.mp4

## Expected behavior

It reloads successfully

## How to reproduce

See above

## Environment

- [x] PostHog Cloud
- [x] self-hosted PostHog, version/commit: latest

## Additional context

Seems the cause is that "refresh" requests data from `/api/insight/trends` vs getting it from `/api/dashboard/id` as on first load.

Relates to #3609  

#### *Thank you* for your bug report – we love squashing them!

posthog/tasks/update_cache.py
INSIGHT_TRENDS,
    TRENDS_STICKINESS,
)
from posthog.decorators import CacheType
from posthog.ee import is_clickhouse_enabled
from posthog.models import DashboardItem, Filter, Team
from posthog.models.filters.path_filter import PathFilter
from posthog.models.filters.retention_filter import RetentionFilter
from posthog.models.filters.stickiness_filter import StickinessFilter
from posthog.models.filters.utils import get_filter
from posthog.settings import CACHED_RESULTS_TTL
from posthog.types import FilterType
from posthog.utils import generate_cache_key
PARALLEL_DASHBOARD_ITEM_CACHE = int(os.environ.get("PARALLEL_DASHBOARD_ITEM_CACHE", 5))
logger = logging.getLogger(__name__)
CH_TYPE_TO_IMPORT = {
    CacheType.TRENDS: ("ee.clickhouse.queries.trends.clickhouse_trends", "ClickhouseTrends"),
    CacheType.SESSION: ("ee.clickhouse.queries.sessions.clickhouse_sessions", "ClickhouseSessions"),
    CacheType.STICKINESS: ("ee.clickhouse.queries.clickhouse_stickiness", "ClickhouseStickiness"),
    CacheType.RETENTION: ("ee.clickhouse.queries.clickhouse_retention", "ClickhouseRetention"),
    CacheType.PATHS: ("ee.clickhouse.queries.clickhouse_paths", "ClickhousePaths"),
}
TYPE_TO_IMPORT = {
    CacheType.TRENDS: ("posthog.queries.trends", "Trends"),
    CacheType.SESSION: ("posthog.queries.sessions", "Sessions"),
    CacheType.STICKINESS: ("posthog.queries.stickiness", "Stickiness"),
    CacheType.RETENTION: ("posthog.queries.retention", "Retention"),
    CacheType.PATHS: ("posthog.queries.paths", "Paths"),
}
def update_cache_item(key: str, cache_type: CacheType, payload: dict) -> None: