TICK script alert thresholds based on another measurement's last value

Hi @nathanielc,

I have two measurements M1 and M2
Want to generated alert based on M1 but the alert thresholds should be derived from M2's Last value

In this case user can dynamically change the alert thresholds by simple adding a value to M2 without any intervention and downtime.

The issue describes alerting on measurement M1 while deriving thresholds from the latest value of M2, but names no files, tests, or entry points. Start by determining whether TICK scripts support this cross-measurement threshold behavior and define how a changing M2 value should update the alert; done means thresholds change dynamically without intervention or downtime.

Written by the indexing model from the issue text.