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Reduce Loki mem usage

Loki (or the way we use loki) eats just too much memory. In #1013 (closed) we increased its mem limits from 1.5G to 2G, which is still not enough because we're getting prom alerts like this after adding mem usage alerts (#816 (closed)):

[1] Firing
Labels
alertname = ContainerMemoryUsage
instance = 213.108.108.57:10250
name = 663db46c4ebeee9eb90161d385755ef2b913fbb6cf073ff7102ac4c30253387b
prometheus = stackspin/kube-prometheus-stack-prometheus
severity = warning
Annotations
description = Container Memory usage is above 80% VALUE = 93.03080240885416 LABELS = map[instance:213.108.108.57:10250 name:663db46c4ebeee9eb90161d385755ef2b913fbb6cf073ff7102ac4c30253387b]
summary = Container Memory usage (instance 213.108.108.57:10250)
Edited by Varac
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