Hi Danilo,
Great, you have started your journey in MDX!
It seems Martin already discussed this with you in another thread: Get all issues by Type and Status using MDX - #4 by martins.vanags
Just a few notes to emphasize important things.
The all issues count is the measure “Issues created” (as any issue has been created). This measure includes all resolved and closed issues as well. So, this is the most universal measure to be used if you need to get the count of all issues (except with change history data).
Read more about all core measures (what they do) here: Jira Core measures and dimensions - eazyBI for Jira
And, very important, measures are mutually independent. Issues usually are counted to several measures (e.g. resolved issues would be counted to “Issues created” and “Issues resolved” (and other); unresolved issues - into “Issues created” and “Issues due”, etc.). When you sum up measures, each issue is counted for each measure, and the result can become incorrect.
Best,
Ilze / support@eazybi.com