DC crawler federation

Addition of crawler details.

Pushover alerts from production only

As submitted via #15.

Trackdb values

Useful to see actual values from trackdb in wa_status rather than only green/amber/red, so now including them.

Alert email address correction

Due to a misconfiguration, email alerts were being sent to an incorrect address. This fix resolves this mistake.

Shift to Stat dashboard panel

This release includes an upgrade to the wa_status dashboard, which now uses the Stat panel (as the SingleStat panel previously used is now depreciated).
It also includes the reporting of the daily change of records in our Solr trackdb service, and removes the alert of another Solr server warning that it is very low on diskspace (which in reality is okay as the amount used is high but constant, not increasing). A new alert now exists for this server just in case its diskspace reaches < 5%.

Pushgateway stats alerting and reporting - production settings

Failed to update with production settings. This update corrects this mistake.

Pushgateway stats alerting and reporting

Addition of service to gather remote stats and inject into prometheus via pushgateway.

Dashboard layout fix

Doubled row size for blocks in wa_status dashboard, to allow for counts to appear within block.

Solr log level monitoring

This release adds the monitoring of solr node log level counts, reported to prometheus via mtail on our solr servers.

Scale down of notifications

The numerous components within monitoring were provided 'more the necessary' announcements of their state. This release has scaled down these notifications.
Other updates have also been included, most significantly the inclusion of the frequent crawl datasource as a yaml-template file.