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Fixes #33453.

Fix provided by RaBe.

Fixes #28317.

 - Handle missing dates correctly.

Implements #33065.

The old PL/pgSQL version of this function made three lookups in the
bwhist table to 1) check whether a row already exists, 2) insert or
update the row, and 3) update the row once again with array sums. The
new SQL version uses the INSERT ON CONFLICT statement introduced in
PostgreSQL 9.5 (Debian stretch has 9.6, buster has 11). The
performance gain measured using metrics-test is impressive, computed
aggregates are equivalent.

Implements #33065.

Fixes #33335.

Fixes #24532.

This reverts commit b3e80fce and also
reverts a similar workaround made after that commit.

The spread() function works fine again using buster's r-cran-tidyr
0.8.2-1 package, whereas it was previously broken with stretch's
r-cran-tidyr 0.6.1-1 package.

Fixes #30351.

Another part of #33008.

Part of #33008.

On the metrics website we're using the term "server" for both relays
and bridges and the term "node" for both clients and servers.

Fixes #26068.

Fixes #33066.

Fixes #31332.

As discussed on the ticket, we can explain better which cells are
counted for onion service traffic graphs: it's cells relayed by
rendezvous points.

It was also confusing to say "per day" in the graph description when
bandwidth is in gigabits per second. Removed that part.

Finally, there's now a glossary entry for "rendezvous points" that is
based on the glossary entry in torspec.

Fixes #26171.

Also configure a base URL in order to turn ExoneraTor's permanent
links into https:// links.

As discussed on #23367.

Related to #24222.

Implements #30793.

Implements #32135.

Fixes #25924.

We shouldn't depend on metrics-lib's implementation classes but only
on its provided interfaces. In this case, downloading and parsing an
index.json file is something that we can easily build ourselves using
a POJO and Jackson. Removing this dependency will make it much easier
to refactor metrics-lib.

Still part of #31204.

Still part of #19332.