How to calculate percentage by another field?

[Hung_Nguyen]

I would like to create a dashboard to show the percentage of each of my service meeting a certain performance requirement.  Each of the request access log entry would have field serviceName, txTime, and I would like to generate a table that show the percentage of requests meeting my SLA requirement of say 1000ms.  

The desired output would look something like

ServiceName                     Percentage
Service1                                98.9%
Service2                                99%

thank you

[yuanliu]

How about 

| eval SLA = if(txTime < 1000, 1, 0)
| stats count sum(SLA) as meetSLA by serviceName
| eval Percentage = 100 * meetSLA / count
| fields - count, meetSLA