promtail update to 6.15.3-bb.4

General MR

Summary

Promtail istio Authz policy testing

big-bang/product/packages/promtail!55 (merged)

big-bang/product/packages/promtail!57 (merged)

Linked Issue

Closes big-bang/product/packages/promtail#34 (closed)

Upgrade Notices

N/A

added botmr promtail statusreview labels

assigned to @ryan.j.garcia

requested review from @chris.oconnell

marked this merge request as ready

changed the description

changed milestone to %2.19.0

approved this merge request

merged

mentioned in commit b86d2551

mentioned in merge request !3675 (closed)

mentioned in merge request big-bang/customers/template!70 (merged)