Update for 0.0.10 of client_java

Document hashmod

Add rsyslog_exporter to exporter list

Document HTTP API v1.

Update exporters.md

Hi,

I've added a link to rabbitMQ exporter.

Kris

Add back Prometheus target to last config example.

Fix link anchor fragments to relabeling docs.

Remove explicit list of client libraries from FAQ.

Docs improvements

Sort list of client libraries alphabetically

Mention Haskell client library

Add Jamie Wilkinson's  Monitorama workshop to media

Document humanizeTimestamp template function.

Guest Post: Monitoring Dreamhack - the World's Largest Digital Festival

This is a guest post on how the networking team on DreamHack used
Prometheus to enhance our monitoring.

Document binary operator precedence.

Update label matching documentation.

This commit adds documentation about the limitations of empty
label matching and documents the `__name__` label which is useful
for federation.