Byte Buddy库
Statistical method call duration
1. Enhanced bytecode
2. Interceptor interception
Similar to spring's aop, except that skywalking cannot use aop, so Byte Buddy technology is used instead
Open Trace
The entire trace call is a directed acyclic graph composed of multiple spans (that is, the call relationship graph).
Spen is a logical running unit, with a start time and an end time, which is generally a logical fragment of an instance of a service.
Each span can have multiple key-value log and tags
log: often used to display the call log, error, info, debug, time concept
tags: no time concept, commonly used to store database execution SQL, or request type
The logical relationship of multiple concepts:
