[RHSman2]

Logging (at scale) is the most important thing to understand reality in your system. At scale, realities are many.

Metrics enable the ability to aggregate concepts into some kind of meaning.

Meaning can then have alerts associated to them.

You cannot create metrics on things you don’t know, which is why logging is the base.

[RHSman2]

Btw: logging and the ability to observe systems was the single and most successful act I have done in my career as a Data Product Manager. I have had to fight, do tricks and ‘play the game’ so much.

I cannot stress the importance of understanding atomic movements.

The cost is high but not as high as the cost of not knowing.