Sri Lanka’s Health Ministry had called for greater caution with multiple clusters coming up in Colombo and several other districts, saying the country is at Alert 03 level which comes before community transmission.

The public are asked to follow DReAM (D-Social Distancing, no gathering, mainly stay at home/Re-Respiratory Etiquette, A – aseptic practices/handwashing/sanitizing) and M – proper use of masks.
 
Alert level 01 is where sporadic cases are reported with index cases from abroad. Alert level 02 is one cluster of cases and Alert Level 03 is several clusters of cases. Alert Level 04 is community transmision when clusters merge and cases appear which cannot be attributed to a cluster anymore.

https://economynext.com/sri-lanka-health-ministry-says-country-in-coronavirus-alert-3-with-multiple-covid-19-clusters-75655/