Manual Chapter : Using Variable Assign to populate gating criteria

Applies To:

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BIG-IP APM

  • 15.0.0
Manual Chapter

Using Variable Assign to populate gating criteria

When you set subroutine gating criteria to the
perflow.custom
or
perflow.scratchpad
variable, you must configure Variable Assign to specify its value.
Using Variable Assign to populate a perflow variable other than
perflow.custom
and
perflow.scratchpad
causes subroutine results to become unreliable.
  1. Open the per-request policy for editing.
  2. Click the name of the Variable Assign agent.
    A Properties screen opens.
  3. Click
    Add new entry
    , and in the new entry, click the
    change
    link.
    A popup screen opens with
    Custom Variable
    selected on the left and
    Custom Expression
    selected on the right.
  4. On the left, select
    Predefined Variables
    .
    Additional fields display.
  5. For
    Group
    , select
    Per-Request Variables
    .
  6. For
    Variable
    , select one of the following:
    • Custom
      - Populates the
      perflow.custom
      variable.
    • Scratchpad
      - Populates the
      perflow.scratchpad
      variable.
  7. On the right, retain
    Custom Expression
    and configure the expression to provide a value.
    The
    Custom Expression
    option provides the greatest flexibility; you can select any other option and configure it.
  8. Click
    Finished
    .
    The popup window closes.
  9. Click
    Save
    .
    The Properties screen closes.