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| - The Redis backlog does not accumulate (_redis backlog_). | ||
| - The relational database backlog does not accumulate (_database backlog_). |
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These could be a bit more elaborate. They currently explain x by saying x again :)
I had to peek into the source code myself to correctly say what this means exactly, so here's the summary:
- Redis backlog means how old is the oldest query in our queue that wasn't processed by Redis yet (i.e. Icinga 2 is generating more queries than it can send to Redis).
- Database backlog means something similar for information that was already written to Redis and is supposed to be forwarded to the relational DB, but hasn't made it there yet. This affects history (so the history tabs might show the most recent information) and runtime updates (newly created objects might not show up yet, or object attributes may be outdated, the latter is mostly relevant for filters in Icinga DB Web as they are only done in SQL, not Redis).
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Thanks. Back then, I only skimmed the code to identify different kinds of errors. I have enriched the two latest points with your suggestions.
Briefly explain what the built-in icingadb check actually checks and what outputs one can expect. This does not contain every possible check output, but touches the different topics the check verifies. References Icinga/icingadb#1009.
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Briefly explain what the built-in icingadb check actually checks and what outputs one can expect. This does not contain every possible check output, but touches the different topics the check verifies.
References Icinga/icingadb#1009.