The PEGA0037 alert indicates that your Pega 7 Platform system took an unusually long time to assemble a rule. Sometimes it comes with pega0017/pega0016/pega0005 alerts.If it is with pega0017 or pega0016 alert then you need to tune cache settings. There are various type of cache like conclusion cache, Rule assemble cache, etc. It needs adjustment.
If it comes with pega0005 then please optimize sql queries.
Pega0037 means rules are taking more time to assemble.You may need to run static assembler to preassemble the rules.
It is frequent in dev because developers create many rules & do frequent changes on them.