[kokomala]

You should always be tracking via the slot when using the totem events, and not via the spellID.

I highly doubt classes other than shaman will have a valid spellID, and the tooltips use tooltip:GetTotem(slot) to fill the tooltip information.

With COMBAT_LOG_EVENT_UNFILTERED and SPELL_SUMMON, you should be able to use something like this (untested):

local summons = {}

function frame:COMBAT_LOG_EVENT_UNFILTERED(timestamp, event,  hideCaster, sourceGUID, sourceName, sourceFlags, sourceRaidFlags, destGUID, destName, destFlags, destRaidFlags, ...)
   if event == 'SPELL_SUMMON' and sourceName == UnitName('player') then
      local spellId, spellName, spellSchool = ...

      -- increment counter
      if not summons[destName] then 
        summons[destName] = {}
      end
        
      summons[destName] = summons[destName][destGUID] = timestamp

      -- demons last 12 seconds, remove from table
     C.Timer.After(12, function() summons[destName][destGUID] = nil end)

   end
end

It's then up to you to have a function that returns the current summons[destName] count, and another function to get the health from the GUID.

Be aware that the above code is untested. I'm also assuming destName/destGUID is used for the summoned demon. You could also store the table as a saved variable, which means you can still get an accurate count after a loading screen.

You could also probably combine them or use some other method to determine how many were summoned.