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by jamesblonde 210 days ago
I still haven't got my head around how OTEL fits into a good open-source monitoring stack. Afaik, it is a protocol for metrics, traces, and logs. And we want our open-source monitoring services/dbs to support it, so they become pluggable. But, afaik, there's no one good DB for logs and metrics, so most of us use Prometheus for metrics and OpenSearch for logs.

Does OTEL mean we just need to replace all our collectors (like logstash for logs and all the native metrics collectors and pushgateway crap) and then reconfigure Prometheus and OpenSearch?
2 comments
pas 210 days ago
logs, spans and metrics are stored as time-stamped stuff. sure simple fixed-width columnar storage is faster, and makes sense to special case for numbers (add downsampling and aggregations, and histogram maintenance and whatnot), but any write-optimized storage engine can handle this, it's not the hard part (basically LevelDB, and if there's need for scaling out it'll look like Cassandra, Aerospike, ScyllaDB, or ClickHouse ... see also https://docs.greptime.com/user-guide/concepts/data-model/ and specialized storage engines https://docs.greptime.com/reference/about-greptimedb-engines... )
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rsanheim 210 days ago
I think the answer is it doesn't fit in any definition of a _good_ monitoring stack, but we are stuck with it. It has largely become the blessed protocol, specification, and standard for OSS monitoring, along every axis (logging, tracing, collecting, instrumentation, etc)...its a bit like the efforts that resulted in J2EE and EJBs back in the day, only more diffuse and with more varied implementations.

And we don't really have a simpler alternative in sight...at least in the java days there was the disgust and reaction via struts, spring, EJB3+, and of course other languages and communities.

Not sure how we exactly we got into such an over-engineered mono-culture in terms of operations and monitoring and deployment for 80%+ of the industry (k8s + graf/loki/tempo + endless supporting tools or flavors), but it is really a sad state.

Then you have endless implementations handling bits and pieces of various parts of the spec, and of course you have the tools to actually ingest and analyze and report on them.

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