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The DevOps 2.2 Toolkit by Viktor Farcic

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Using shortcuts to define alerts

Setting alerts as service labels is great but, as you probably noticed, a bit cumbersome. Alert conditions can get pretty long and repetitive. I, for one, got tired of writing the same statement over and over again. So, I created shortcuts that accomplish the same functionality. Let's see them in action.

The modified version of the go-demo stack definition is as follows (restricted to relevant parts).

version: '3' 
 
services: 
 
 main: 
    ... 
   deploy: 
      ... 
      labels: 
        - com.df.alertIf=@service_mem_limit:0.8 
        ... 

We simplified the definition by replacing the expression that follows with com.df.alertIf=@service_mem_limit:0.8.

com.df.alertIf=container_memory_usage_bytes{container_label_com_\docker_swarm_service_name="go-demo_main"}/container_spec_memory_limit_\ ...

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