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_\
bytes{container_label_com_docker_swarm_service_name="go-demo_main"}\
> 0.8 

Similarly, the modified version of the exporter stack definition is as follows (limited to relevant...