Since quests on level 60 depend on the chosen covenant and the renown standing with them we should make use of

https://wow.gamepedia.com/Category:API_namespaces/C_CovenantSanctumUI

COVENANT_CHOSEN (event)
returns the ID of the covenant

local covenantID = C_Covenants.GetCovenantIDs()
local covenantID = C_Covenants.GetActiveCovenantID()

local level = C_CovenantSanctumUI.GetRenownLevel()
local levels = C_CovenantSanctumUI.GetRenownLevels(covenantID)
local rewards = C_CovenantSanctumUI.GetRenownRewardsForLevel(covenantID, renownLevel)

COVENANT_RENOWN_INTERACTION_ENDED
COVENANT_RENOWN_INTERACTION_STARTED

COVENANT_SANCTUM_RENOWN_LEVEL_CHANGED
COVENANT_SANCTUM_RENOWN_LEVEL_CHANGED: newRenownLevel, oldRenownLevel

So that the log includes hints about the changes so we can track quests more easily

Grail 114 (and GitHub) has registered for some events to help process covenant changes and renown level changes to have the quest statuses updated.

I think we should

• print the current covenant & renown level to log on login
• log and print the covenant change to chat & log it
• log and print the renown level change to chat & log it

in addition to just invalidating quests when we observe changes.

The latest Grail in GitHub (and 114) has logging as suggested.