Monitor scheduled jobs

See merge request !51

Return a correct result structure in case of an exception in CiBuildsCollector#get_builds

See merge request !50

Add notes on how to run gitlab-monitor as a Web exporter

See merge request !47

Collect Sidekiq dead jobs count

Closes #23

See merge request !49

Add monitoring for queries that are idle in transaction state too long

See merge request !48

Add a list of exported metrics to the README

See merge request !45

Minor README cleanup

See merge request !46

Adds relative links to the YAML configuration file, corrects a
"postgresq" typo, and adds inline code blocks where it makes sense.

Fix error 500 when process file goes away in a race condition

Closes #16

See merge request !44

Update to new CI schema: gl_project_id => project_id

See merge request !43

Add a row count for Uploads

See merge request !42

Closes #20

Cleanup stale builds metric

See merge request !41

Use literal output instead of matching individual lines.

* Update metric name to match new convention.
* Remove unecessary labels.
* Update specs.

Improve CI builds metrics

See merge request !40

Use `namespace_id` in place of `namespaces.path` in order to obfuscate
the namespace in the metrics.

Test for all cases of "other" buckets.

* Don't create the "other" buckets until after all other buckets are
  done.

* Combine all running workers into one query
* Update specs.

* Remove `_total` from metric name, this is a gauge.
* Split `running` and `created` builds into separate metrics.
* Add `namespace.path` as new metric label.
* Refactor `metrics_total` function to support new metrics and labeling.
* Reduce cardinality for `pending` and `created` builds by ignoring
  values less than 10.
* Split stale builds metrics to separate function.
* Update specs.

Add count of created jobs to ci_builds_total metric

See merge request !39