Motivation

Detect anomalies on Tezos networks or be able to answer questions such as :

• M nodes received some attestations or blocks but N nodes did not
• How much time elapsed between the moment the first node receives an attestation and the moment the last node receives the same attestation
• Do a node always receive attestations or blocks X ms after another node ?
• Do different nodes receive attestations in the same order ?
• Do all nodes receive attestations in the same time period ?
• Which nodes have not received attestations or blocks they should have ?
• Which nodes are not in good health ?
• Which nodes are always late, always receive their attestations after every other nore ?
• Which nodes receive attestations or blocks with a delay that significantly deviates from the mean ? from the median ?

Workbreakdown

Back-end

• Archiver saves data on disk for later replay when database is not available (issues teztale#33 (closed), teztale#25 (closed), teztale#20 (closed))
• Collect level of first block of each cycle in a new table (issue teztale#26 (closed), @pikatos)
• Annotate archiver messages by chain-id (issue teztale#30)
• Collect info about non proposed blocks received at round N, but not at lesser rounds) (issue teztale#31 (closed))

Front-end

• Display a new page to show arriving or exiting of bakers between rounds : teztale-dataviz#16 (closed)
• Add a page to list all downtimes (i.e. all levels with round greater than a chosen parameter) (@sagotch )
• Display a new page with the following health metrics: teztale#17 (@sagotch)
  • Start by testing with few queries of a range of levels (teztale#29 (closed))
  • Handle the rest in dataviz
• Display a page comparing reception delays of attestations or blocks from multiple nodes in a given network
• User documentation (e.g. blog post for teztale setup, tooltips explaining each data exposed directly in teztale-dataviz, user manual)
• Fix concurrency problem : sometimes query to get data for a given level is executed while data for the said level is still being inserted in the database