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Filip Petkovski 583f3e587c Optimize histogram iterators (#13340) ... Optimize histogram iterators Histogram iterators allocate new objects in the AtHistogram and AtFloatHistogram methods, which makes calculating rates over long ranges expensive. In #13215 we allowed an existing object to be reused when converting an integer histogram to a float histogram. This commit follows the same idea and allows injecting an existing object in the AtHistogram and AtFloatHistogram methods. When the injected value is nil, iterators allocate new histograms, otherwise they populate and return the injected object. The commit also adds a CopyTo method to Histogram and FloatHistogram which is used in the BufferedIterator to overwrite items in the ring instead of making new copies. Note that a specialized HPoint pool is needed for all of this to work (`matrixSelectorHPool`). --------- Signed-off-by: Filip Petkovski <filip.petkovsky@gmail.com> Co-authored-by: George Krajcsovits <krajorama@users.noreply.github.com>		2 years ago
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exemplar	Scraping: use slices.sort for exemplars	2 years ago
histogram	Optimize histogram iterators (#13340)	2 years ago
labels	labels: extract common code between slice and stringlabels	2 years ago
metadata	Move metric type definitions to common/model	2 years ago
relabel	relabel: blank replacement deletes label post-regexp	2 years ago
rulefmt	golangci-lint: enable testifylint linter (#13254)	2 years ago
textparse	Merge pull request #13299 from vesari/add-unit-parser	2 years ago
timestamp	Move packages out of deprecated pkg directory	4 years ago
value	Move packages out of deprecated pkg directory	4 years ago