The diagram below shows the fault tree analysis for Heroic consumers using PubSub for ingestion, and Bigtable and Elasticsearch for storage. This is a useful tool for reasoning about reliability of the system and determining reasonable SLOs.
Some assumptions are made that negatively affect the accuracy of the model and the calculated probabilities should be seen as being quite pessimistic. The biggest assumptions are:
Click and drag the diagram to pan around. Branches can be collapsed/expanded by clicking on a node, and hovering over a node will show a longer description.
The source data used to generate the fault tree can be downloaded here: pubsub-consumers.mef