load-balancer

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Currently we have a mix of:

• Out of memory error.
• Out of memory error
• out of memory error
• out of memory
• out of memory.
• out of memory [some context]

All these should be adjusted to use the same wording for consistency and it should also make the executable a little bit smaller 😄

Add events and logs in key places during service processing, such as allocate and release EIP, GoBGP synchronization Nexthop, Layer2 mode selection Node

Describe the bug

A clear and concise description of the bug.
when my asp.net core 3.1 app host in IIS, the url console is 127.0.0.1，so，when i have Multiple instances，the instances name will be the same,such as 127.0.0.1:svaname:port，eureka server think they are a single instance.
i print the console in source code：
![image](https://user-images.githubusercontent.com/6300834/101754289-8ad92

Add a prometheus exporter! Example outputs:

• Layer 2
• Layer 3
• TCP LoadBalancer
• IPVS LoadBalancer (once @yastij implements it ;)
• Control Pane HA