can anyone help me understand a query from prometheus with data from node-exporter?
I have taken a query from the community, it is the following - notice the "1 -" in front of the full query. This is the query I obtained.
(1 - (node_memory_MemAvailable_bytes{node_type=~"mining"} / (node_memory_MemTotal_bytes{node_type=~"mining"})))* 100 > 75
I don't understand why the "1-" is there. This particular query right now returns 2 results.
I removed the "1-" like so
(node_memory_MemAvailable_bytes{node_type=~"mining"} / (node_memory_MemTotal_bytes{node_type=~"mining"}))* 100 > 75
Now the query returns 4 results.
I am a little confused at which is correct and why would the "1-" be before the query.
Here is a screenshot showing the prometheus query results
Could anybody help or explain and maybe I am missing something.
