MINOR: contrib/prometheus-exporter: Rename some metrics to be more usable

Some metrics have been renamed and their type adapted to be more usable in
Prometheus:

  * haproxy_process_uptime_seconds -> haproxy_process_start_time_seconds
  * haproxy_process_max_memory -> haproxy_process_max_memory_bytes
  * haproxy_process_pool_allocated_total -> haproxy_process_pool_allocated_bytes
  * haproxy_process_pool_used_total -> haproxy_process_pool_used_bytes
  * haproxy_process_ssl_cache_lookups -> haproxy_process_ssl_cache_lookups_total
  * haproxy_process_ssl_cache_misses -> haproxy_process_ssl_cache_misses_total

No backport needed. See issue #81 on github.
diff --git a/contrib/prometheus-exporter/README b/contrib/prometheus-exporter/README
index 1fb5503..d02c64d 100644
--- a/contrib/prometheus-exporter/README
+++ b/contrib/prometheus-exporter/README
@@ -61,17 +61,17 @@
 | haproxy_process_nbthread                       | Configured number of threads.                                                 |
 | haproxy_process_nbproc                         | Configured number of processes.                                               |
 | haproxy_process_relative_process_id            | Relative process id, starting at 1.                                           |
-| haproxy_process_uptime_seconds                 | Uptime in seconds.                                                            |
-| haproxy_process_max_memory                     | Per-process memory limit (in MB); 0=unset.                                    |
-| haproxy_process_pool_allocated_total           | Total amount of memory allocated in pools (in MB).                            |
-| haproxy_process_pool_used_total                | Total amount of memory used in pools (in MB).                                 |
+| haproxy_process_start_time_seconds             | Start time in seconds.                                                        |
+| haproxy_process_max_memory_bytes               | Per-process memory limit (in bytes); 0=unset.                                 |
+| haproxy_process_pool_allocated_bytes           | Total amount of memory allocated in pools (in bytes).                         |
+| haproxy_process_pool_used_bytes                | Total amount of memory used in pools (in bytes).                              |
 | haproxy_process_pool_failures_total            | Total number of failed pool allocations.                                      |
 | haproxy_process_max_fds                        | Maximum number of open file descriptors; 0=unset.                             |
 | haproxy_process_max_sockets                    | Maximum numer of open sockets.                                                |
 | haproxy_process_max_connections                | Maximum number of concurrent connections.                                     |
 | haproxy_process_hard_max_connections           | Initial Maximum number of concurrent connections.                             |
 | haproxy_process_current_connections            | Number of active sessions.                                                    |
-| haproxy_process_connections_total              | Total number of terminated sessions.                                          |
+| haproxy_process_connections_total              | Total number of created sessions.                                             |
 | haproxy_process_requests_total                 | Total number of requests (TCP or HTTP).                                       |
 | haproxy_process_max_ssl_connections            | Configured maximum number of concurrent SSL connections.                      |
 | haproxy_process_current_ssl_connections        | Number of opened SSL connections.                                             |
@@ -93,8 +93,8 @@
 | haproxy_process_frontent_ssl_reuse             | SSL session reuse ratio (percent).                                            |
 | haproxy_process_current_backend_ssl_key_rate   | Current backend SSL Key computation per second over last elapsed second.      |
 | haproxy_process_max_backend_ssl_key_rate       | Maximum observed backend SSL Key computation per second.                      |
-| haproxy_process_ssl_cache_lookups              | Total number of SSL session cache lookups.                                    |
-| haproxy_process_ssl_cache_misses               | Total number of SSL session cache misses.                                     |
+| haproxy_process_ssl_cache_lookups_total        | Total number of SSL session cache lookups.                                    |
+| haproxy_process_ssl_cache_misses_total         | Total number of SSL session cache misses.                                     |
 | haproxy_process_http_comp_bytes_in_total       | Number of bytes per second over last elapsed second, before http compression. |
 | haproxy_process_http_comp_bytes_out_total      | Number of bytes per second over last elapsed second, after http compression.  |
 | haproxy_process_limit_http_comp                | Configured maximum input compression rate in bytes.                           |
diff --git a/contrib/prometheus-exporter/service-prometheus.c b/contrib/prometheus-exporter/service-prometheus.c
index dd9128a..bf94b85 100644
--- a/contrib/prometheus-exporter/service-prometheus.c
+++ b/contrib/prometheus-exporter/service-prometheus.c
@@ -430,10 +430,10 @@
 	[INF_PROCESS_NUM]                    = IST("relative_process_id"),
 	[INF_PID]                            = IST("pid"),
 	[INF_UPTIME]                         = IST("uptime"),
-	[INF_UPTIME_SEC]                     = IST("uptime_seconds"),
-	[INF_MEMMAX_MB]                      = IST("max_memory"),
-	[INF_POOL_ALLOC_MB]                  = IST("pool_allocated_total"),
-	[INF_POOL_USED_MB]                   = IST("pool_used_total"),
+	[INF_UPTIME_SEC]                     = IST("start_time_seconds"),
+	[INF_MEMMAX_MB]                      = IST("max_memory_bytes"),
+	[INF_POOL_ALLOC_MB]                  = IST("pool_allocated_bytes"),
+	[INF_POOL_USED_MB]                   = IST("pool_used_bytes"),
 	[INF_POOL_FAILED]                    = IST("pool_failures_total"),
 	[INF_ULIMIT_N]                       = IST("max_fds"),
 	[INF_MAXSOCK]                        = IST("max_sockets"),
@@ -462,8 +462,8 @@
 	[INF_SSL_FRONTEND_SESSION_REUSE_PCT] = IST("frontent_ssl_reuse"),
 	[INF_SSL_BACKEND_KEY_RATE]           = IST("current_backend_ssl_key_rate"),
 	[INF_SSL_BACKEND_MAX_KEY_RATE]       = IST("max_backend_ssl_key_rate"),
-	[INF_SSL_CACHE_LOOKUPS]              = IST("ssl_cache_lookups"),
-	[INF_SSL_CACHE_MISSES]               = IST("ssl_cache_misses"),
+	[INF_SSL_CACHE_LOOKUPS]              = IST("ssl_cache_lookups_total"),
+	[INF_SSL_CACHE_MISSES]               = IST("ssl_cache_misses_total"),
 	[INF_COMPRESS_BPS_IN]                = IST("http_comp_bytes_in_total"),
 	[INF_COMPRESS_BPS_OUT]               = IST("http_comp_bytes_out_total"),
 	[INF_COMPRESS_BPS_RATE_LIM]          = IST("limit_http_comp"),
@@ -586,17 +586,17 @@
 	[INF_PROCESS_NUM]                    = IST("Relative process id, starting at 1."),
 	[INF_PID]                            = IST("HAProxy PID."),
 	[INF_UPTIME]                         = IST("Uptime in a human readable format."),
-	[INF_UPTIME_SEC]                     = IST("Uptime in seconds."),
-	[INF_MEMMAX_MB]                      = IST("Per-process memory limit (in MB); 0=unset."),
-	[INF_POOL_ALLOC_MB]                  = IST("Total amount of memory allocated in pools (in MB)."),
-	[INF_POOL_USED_MB]                   = IST("Total amount of memory used in pools (in MB)."),
+	[INF_UPTIME_SEC]                     = IST("Start time in seconds."),
+	[INF_MEMMAX_MB]                      = IST("Per-process memory limit (in bytes); 0=unset."),
+	[INF_POOL_ALLOC_MB]                  = IST("Total amount of memory allocated in pools (in bytes)."),
+	[INF_POOL_USED_MB]                   = IST("Total amount of memory used in pools (in bytes)."),
 	[INF_POOL_FAILED]                    = IST("Total number of failed pool allocations."),
 	[INF_ULIMIT_N]                       = IST("Maximum number of open file descriptors; 0=unset."),
 	[INF_MAXSOCK]                        = IST("Maximum numer of open sockets."),
 	[INF_MAXCONN]                        = IST("Maximum number of concurrent connections."),
 	[INF_HARD_MAXCONN]                   = IST("Initial Maximum number of concurrent connections."),
 	[INF_CURR_CONN]                      = IST("Number of active sessions."),
-	[INF_CUM_CONN]                       = IST("Total number of terminated sessions."),
+	[INF_CUM_CONN]                       = IST("Total number of created sessions."),
 	[INF_CUM_REQ]                        = IST("Total number of requests (TCP or HTTP)."),
 	[INF_MAX_SSL_CONNS]                  = IST("Configured maximum number of concurrent SSL connections."),
 	[INF_CURR_SSL_CONNS]                 = IST("Number of opened SSL connections."),
@@ -1240,16 +1240,16 @@
 				metric = mkf_u32(FO_KEY, relative_pid);
 				break;
 			case INF_UPTIME_SEC:
-				metric = mkf_u32(FN_DURATION, (now.tv_sec - start_date.tv_sec));
+				metric = mkf_u32(FN_DURATION, start_date.tv_sec);
 				break;
 			case INF_MEMMAX_MB:
-				metric = mkf_u32(FO_CONFIG|FN_LIMIT, global.rlimit_memmax);
+				metric = mkf_u64(FO_CONFIG|FN_LIMIT, global.rlimit_memmax * 1048576L);
 				break;
 			case INF_POOL_ALLOC_MB:
-				metric = mkf_u32(0, (unsigned)(pool_total_allocated() / 1048576L));
+				metric = mkf_u64(0, pool_total_allocated());
 				break;
 			case INF_POOL_USED_MB:
-				metric = mkf_u32(0, (unsigned)(pool_total_used() / 1048576L));
+				metric = mkf_u64(0, pool_total_used());
 				break;
 			case INF_POOL_FAILED:
 				metric = mkf_u32(FN_COUNTER, pool_total_failures());