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What does a gray area on my chart mean?

What does a gray area on my chart mean?​

A gray area on the chart indicates that DEM could not collect data during that period, or that the data was null or non-existent.

This can happen when:

  • a scenario was manually disabled by a site administrator for a given period (in which case events should mark the start and end of the gray area)
  • a server in the System section stopped sending data (for example: a network issue or a temporary shutdown of the server hosting the monitored site)
  • you're viewing profiler data in the Applications section (for PHP applications) and the page was served from a full-page cache (for example Varnish). In that case there is no PHP execution and therefore no profiler data to record.

Finally, in rare situations, DEM's STM probes may be non-functional for a few minutes. To avoid skewing analysis by making it appear the site was unreachable, DEM displays a gray area (red indicates a detected incident on the monitored site).