Add service ping troubleshooting to Troublehooting guide
Problem
The troubleshooting guide in gitlab-com/www-gitlab-com!129934 (diffs, comment 1591323596) only includes information specific to Snowplow but nothing about how to troubleshoot problems with Service Ping including the version app.
Desired Outcome
There's enough information in the guide for everyone on the team to feel confident to get started with an investigation.
Potential Solutions
TBD
How to verify
Guide is present and acknowledged by the whole team