Попробуйте:
=ARRAYFORMULA(
COUNTIFS(JIRA!A:A, E2, MONTH(JIRA!B:B), MONTH("October"&1), JIRA!D:D, "completed")&" / "&
COUNTIFS(JIRA!A:A, E2, MONTH(JIRA!B:B), MONTH("October"&1), JIRA!D:D, "scheduled"))
или:
=ARRAYFORMULA(
COUNTIFS(JIRA!A:A, E2, MONTH(JIRA!B:B), MONTH("Oct"&1), JIRA!D:D, "completed")&" / "&
COUNTIFS(JIRA!A:A, E2, MONTH(JIRA!B:B), MONTH("Oct"&1), JIRA!D:D, "scheduled"))
или:
=ARRAYFORMULA(
COUNTIFS(JIRA!A:A, E2, MONTH(JIRA!B:B), MONTH("10/10/2019"), JIRA!D:D, "completed")&" / "&
COUNTIFS(JIRA!A:A, E2, MONTH(JIRA!B:B), MONTH("10/10/2019"), JIRA!D:D, "scheduled"))
или:
=ARRAYFORMULA(
COUNTIFS(JIRA!A:A, E2, MONTH(JIRA!B:B), 10, JIRA!D:D, "completed")&" / "&
COUNTIFS(JIRA!A:A, E2, MONTH(JIRA!B:B), 10, JIRA!D:D, "scheduled"))