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Rule: Alias

The alias rule is a convenience statement, to reduce the need to type long path names every time.

The identifiers created with an alias statement are not metric groups and won't get emitted to the Processor.

Syntax

alias groupname as identifier ;

  • groupname The name of a group.
  • identifier A variable name under which to bind the group.

Example

Consider a TSData with the following data:

com.groupon.brands.strsearch.CachedBasicNormalizedLevenshteinNameSearch.WorldwideBrandNameSearch.loadAllUncached {
  50thPercentile 240,
  75thPercentile 241,
  95thPercentile 273,
  98thPercentile 301,
  99thPercentile 353,
  999thPercentile 798
}

and the need to refer to this metric a lot. Since it's inconvenient to type out the entire name in the expressions each time, we want to have a shorter name to refer to it.

alias com.groupon.brands.strsearch.CachedBasicNormalizedLevenshteinNameSearch.WorldwideBrandNameSearch.loadAllUncached
as WWB_namesearch_ldUncached;

Now, instead of writing future rules like this:

alert my_alert
if com.groupon.brands.strsearch.CachedBasicNormalizedLevenshteinNameSearch.WorldwideBrandNameSearch.loadAllUncached as WWB_namesearch_ldUncached '50thPercentile' > 500
for 10m;

we can instead write:

alert my_alert
if WWB_namesearch_ldUncached '50thPercentile' > 500
for 10m;

which is much more readable.