One piece of advice here is, if you pitch yourself as a datadog competitor, then I would recommend replicating some of the GTM motions that datadog employed. For instance, you have an opportunity to go very upmarket, super enterprise orgs. You can do PLG, but ultimately every tool becomes SLG. I would recommend fine tuning that motion as that would be the one bringing larger contract 6 digit contracts and huge growth here.

I have seen orgs remove datadog because of unpredictable pricing. If you do flat price self hosted platform, you will get attention. I dont think orgs would mind hosting clickhouse. You can also bundle it with your helm charts or initial proof of concept might have lower barrier. I know some orgs have million dollar annual contracts with datadog, a cheaper more predictable priced alternative will definitely get attention.