HealthWarning

A highly customizable addon that provides notifications when your character, pet, or partner (see below) are low on health or mana.

Requires EasyOptions.

Provides text, sound, and/or screen flash notifications when your character, pet, or partner are low on health or mana.
Highly customizable with over 200 options!
Includes a test mode for easy configuration.
Implements EasyOptions which allows you to save, load, and manage custom settings for different characters or types of content, such as PvP, PvE, raiding, M+, soloing, tanking, gathering, etc.

Your partner is determined from a "Partner Priority List" that can be edited in the options for this addon.

Various modes and settings give you control over how your partner is determined and allow your health and mana partners to be separate players.

Standard unit IDs can be used in the list and include the following:

target

focus

pet

player1, player2, etc.

raid1, raid2, etc.

Player names can also be added to the list, but those will only function if the player is in your group due to a WoW API limitation.

You can always show health or mana labels by setting the High Threshold for the desired value(s) to 100% and disable text animation.
Mana notifications are not supported for your pet.