It's a bad idea to query all metrics, as it will touch all timeseries and
create a huge amount of work in I/O and memory usage. But you can, and on
a small test system it will probably be OK: the query is
{__name__=~".+"}
On a production system: you always want to ensure you're not touching every
timeseries. Normally you'd do that by giving the metric name:
process_virtual_memory_bytes
is the same as
{__name__="process_virtual_memory_bytes"}
If you have another way to narrow it down to just a subset of series it
should be OK, e.g.
{__name__=~".+",instance="foo.example.com"}
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