Some components like go-ds-measure, go-ipfs-blockstore and go-bitswap
expose metrics via ipfs/go-metrics-interface, but Lotus never injects
the Prometheus exporter (ipfs/go-metrics-prometheus). Therefore, those
metrics never surface in instrumentation.
Instead, Lotus uses OpenCensus directly.
This commit injects the Prometheus exporter for go-metrics-interface, and
instructs the OpenCensus Prometheus exporter to use the DefaultRegistry.
This has the effect of exposing blending the metrics of both metrics
libraries.
With this patch, the datastore, cache utilisation, and bitswap metrics
are now exported via the /debug/metrics endpoint.
This commit also fixes an issue where the metrics scope was empty, making
go-metrics-interface default to "<no-scope>". Angle brackets are inadmissible
characters for Prometheus, so it was refusing to export the affected metrics.
(These were the ARC cache metrics.)
This solves a problem with folks resurrecting long-out-of-sync nodes via
snapshot imports.
The interface switch to Batching is necessary: startup is too long otherwise
( 8 minutes just to clear everything on a relatively old node )
Motivation:
* Run lotus with the race detector enabled (primary motivation).
* Allow multiple lotus nodes in a process (not a high priority).
Previously, the journal was shared between all lotus instances, but it was
initialized for every new node. This caused safety problems in tests (at a
minimum).
This patch explicitly passes the journal to all services that need it.
* updates bitswap to include _many_ perf enhancements and bug fixes.
* updates go-fs-lock because the version here is pretty old.
* updates go-libp2p
* updates bbloom _just_ in case, because the version we were depending on had bugs (looks like we're not actually using it).
