- stage_senders: don't re-calc existing senders
- stage_tx_lookup: prune less blocks per iteration - because
random-deletes are expensive. pruning must not slow-down sync.
- prune data even if --snap.stop is set
- "prune as-much-as-possible at startup" is not very good idea: at
initialCycle machine can be cold and prune will cause big downtime, no
reason to produce much freelist in 1 tx. People may also restart erigon
- because of some bug - and it will cause unexpected downtime (usually
Erigon startup very fast). So, I just remove all `initialSync`-related
logic in pruning.
- fix lost metrics about disk write byte/sec
Exposing /debug/metrics and /debug/metrics/prometheus was dependent
on --pprof, which also exposes other HTTP APIs. This change makes it possible
to run the metrics server on an independent endpoint without enabling pprof.
# Conflicts:
# cmd/utils/flags.go
# internal/debug/flags.go
# metrics/exp/exp.go
# mobile/geth.go
* metrics/prometheus: added prometheus http server and metrics collector
* metrics/prometheus: minor cleanups
* metrics/prometheus: named keys instead name in tag
* metrics/prometheus: minor typo cleanups, sorted report
* metrics: expvar support for ResettingTimer
* metrics: use integers for percentiles; remove Overall
* metrics: fix edge-case panic for index-out-of-range
